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levothyroxine (oral/injection)

Pronunciation: LEE voe thye ROX een

Synthroid

slide 1 of 142, Synthroid,

137 mcg (0.137 mg), round, blue, imprinted with SYNTHROID, 137

slide 1 of 142

Synthroid

slide 2 of 142, Synthroid,

25 mcg (0.025 mg), round, orange, imprinted with SYNTHROID, 25

slide 2 of 142

Synthroid

slide 3 of 142, Synthroid,

50 mcg (0.05 mg), round, white, imprinted with SYNTHROID, 50

slide 3 of 142

Synthroid

slide 4 of 142, Synthroid,

75 mcg (0.075 mg), round, lavender, imprinted with SYNTHROID, 75

slide 4 of 142

Synthroid

slide 5 of 142, Synthroid,

88 mcg (0.088 mg), round, green, imprinted with SYNTHROID, 88

slide 5 of 142

Synthroid

slide 6 of 142, Synthroid,

100 mcg (0.1 mg), round, yellow, imprinted with SYNTHROID, 100

slide 6 of 142

Synthroid

slide 7 of 142, Synthroid,

125 mcg (0.125 mg), round, beige, imprinted with SYNTHROID, 125

slide 7 of 142

Synthroid

slide 8 of 142, Synthroid,

150 mcg (0.15 mg), round, blue, imprinted with SYNTHROID, 150

slide 8 of 142

Synthroid

slide 9 of 142, Synthroid,

175 mcg (0.175 mg), round, purple, imprinted with SYNTHROID, 175

slide 9 of 142

Synthroid

slide 10 of 142, Synthroid,

200 mcg (0.2 mg), round, pink, imprinted with SYNTHROID, 200

slide 10 of 142

Synthroid

slide 11 of 142, Synthroid,

300 mcg (0.3 mg), round, green, imprinted with SYNTHROID, 300

slide 11 of 142

Synthroid

slide 12 of 142, Synthroid,

112 mcg (0.112 mg), round, pink, imprinted with SYNTHROID, 112

slide 12 of 142

Levothyroxine Sodium

slide 13 of 142, Levothyroxine Sodium,

25 mcg (0.025 mg), capsule, orange, imprinted with M, L 4

slide 13 of 142

Levothyroxine Sodium

slide 14 of 142, Levothyroxine Sodium,

50 mcg (0.05 mg), capsule, white, imprinted with M, L 5

slide 14 of 142

Levothyroxine Sodium

slide 15 of 142, Levothyroxine Sodium,

75 mcg (0.075 mg), oval, purple, imprinted with M, L 6

slide 15 of 142

Levothyroxine Sodium

slide 16 of 142, Levothyroxine Sodium,

88 mcg (0.088 mg), capsule, olive, imprinted with M, L 7

slide 16 of 142

Levothyroxine Sodium

slide 17 of 142, Levothyroxine Sodium,

100 mcg (0.1 mg), oval, yellow, imprinted with M, L 8

slide 17 of 142

Levothyroxine Sodium

slide 18 of 142, Levothyroxine Sodium,

112 mcg (0.112 mg), oval, pink, imprinted with M, L 9

slide 18 of 142

Levothyroxine Sodium

slide 19 of 142, Levothyroxine Sodium,

125 mcg (0.125 mg), capsule, gray, imprinted with M, L 10

slide 19 of 142

Levothyroxine Sodium

slide 20 of 142, Levothyroxine Sodium,

150 mcg (0.15 mg), capsule, blue, imprinted with M, L 11

slide 20 of 142

Levothyroxine Sodium

slide 21 of 142, Levothyroxine Sodium,

175 mcg (0.175 mg), oval, lilac, imprinted with M, L 12

slide 21 of 142

Levothyroxine Sodium

slide 22 of 142, Levothyroxine Sodium,

200 mcg (0.2 mg), oblong, pink, imprinted with M, L 13

slide 22 of 142

Levothyroxine Sodium

slide 23 of 142, Levothyroxine Sodium,

300 mcg (0.3 mg), oblong, dark green, imprinted with M, L 14

slide 23 of 142

Levothyroxine Sodium

slide 24 of 142, Levothyroxine Sodium,

137 mcg (0.137 mg), oblong, blue, imprinted with M, L 15

slide 24 of 142

Levothyroxine Sodium

slide 25 of 142, Levothyroxine Sodium,

25 mcg (0.025 mg), round, orange, imprinted with JSP, 513

slide 25 of 142

Levothyroxine Sodium

slide 26 of 142, Levothyroxine Sodium,

50 mcg (0.05 mg), round, white, imprinted with JSP, 514

slide 26 of 142

Levothyroxine Sodium

slide 27 of 142, Levothyroxine Sodium,

75 mcg (0.075 mg), round, purple, imprinted with JSP, 515

slide 27 of 142

Levothyroxine Sodium

slide 28 of 142, Levothyroxine Sodium,

88 mcg (0.088 mg), round, green, imprinted with JSP, 561

slide 28 of 142

Levothyroxine Sodium

slide 29 of 142, Levothyroxine Sodium,

100 mcg (0.1 mg), round, yellow, imprinted with JSP, 516

slide 29 of 142

Levothyroxine Sodium

slide 30 of 142, Levothyroxine Sodium,

112 mcg (0.112 mg), round, pink, imprinted with JSP 562

slide 30 of 142

Levothyroxine Sodium

slide 31 of 142, Levothyroxine Sodium,

125 mcg (0.125 mg), round, beige, imprinted with JSP, 519

slide 31 of 142

Levothyroxine Sodium

slide 32 of 142, Levothyroxine Sodium,

150 mcg (0.15 mg), round, blue, imprinted with JSP, 520

slide 32 of 142

Levothyroxine Sodium

slide 33 of 142, Levothyroxine Sodium,

175 mcg (0.175 mg), round, lavender, imprinted with JSP, 563

slide 33 of 142

Levothyroxine Sodium

slide 34 of 142, Levothyroxine Sodium,

200 mcg (0.2 mg), round, pink, imprinted with JSP, 522

slide 34 of 142

Levothyroxine Sodium

slide 35 of 142, Levothyroxine Sodium,

300 mcg (0.3 mg), round, green, imprinted with JSP 523

slide 35 of 142

Levothyroxine Sodium

slide 36 of 142, Levothyroxine Sodium,

137 mcg (0.137 mg), round, blue, imprinted with JSP, 564

slide 36 of 142

Levothyroxine Sodium

slide 37 of 142, Levothyroxine Sodium,

25 mcg (0.025 mg), capsule, orange, imprinted with 25, GG 331

slide 37 of 142

Levothyroxine Sodium

slide 38 of 142, Levothyroxine Sodium,

50 mcg (0.05 mg), oblong, white, imprinted with 50, GG 332

slide 38 of 142

Levothyroxine Sodium

slide 39 of 142, Levothyroxine Sodium,

75 mcg (0.075 mg), oblong, lavender, imprinted with 75, GG 333

slide 39 of 142

Levothyroxine Sodium

slide 40 of 142, Levothyroxine Sodium,

88 mcg (0.088 mg), capsule, green, imprinted with 88, GG 334

slide 40 of 142

Levothyroxine Sodium

slide 41 of 142, Levothyroxine Sodium,

100 mcg (0.1 mg), oblong, yellow, imprinted with 100, GG 335

slide 41 of 142

Levothyroxine Sodium

slide 42 of 142, Levothyroxine Sodium,

112 mcg (0.112 mg), capsule, red, imprinted with 112, GG 336

slide 42 of 142

Levothyroxine Sodium

slide 43 of 142, Levothyroxine Sodium,

125 mcg (0.125 mg), oblong, beige, imprinted with GG 337, 125

slide 43 of 142

Levothyroxine Sodium

slide 44 of 142, Levothyroxine Sodium,

150 mcg (0.15 mg), capsule, blue, imprinted with 150, GG 338

slide 44 of 142

Levothyroxine Sodium

slide 45 of 142, Levothyroxine Sodium,

175 mcg (0.175 mg), capsule, purple, imprinted with 175, GG 339

slide 45 of 142

Levothyroxine Sodium

slide 46 of 142, Levothyroxine Sodium,

200 mcg (0.2 mg), oblong, pink, imprinted with 200, GG 340

slide 46 of 142

Levothyroxine Sodium

slide 47 of 142, Levothyroxine Sodium,

300 mcg (0.3 mg), oblong, green, imprinted with 300, GG 341

slide 47 of 142

Levothyroxine Sodium

slide 48 of 142, Levothyroxine Sodium,

137 mcg (0.137 mg), capsule, green, imprinted with 137, GG 330

slide 48 of 142

Levoxyl

slide 49 of 142, Levoxyl,

88 mcg (0.088 mg), oval, green, imprinted with LEVOXYL, dp 88

slide 49 of 142

Levoxyl

slide 50 of 142, Levoxyl,

100 mcg (0.1 mg), oval, yellow, imprinted with LEVOXYL, dp 100

slide 50 of 142

Levoxyl

slide 51 of 142, Levoxyl,

150 mcg (0.15 mg), oval, blue, imprinted with LEVOXYL, dp 150

slide 51 of 142

Levoxyl

slide 52 of 142, Levoxyl,

175 mcg (0.175 mg), oval, turquoise, imprinted with LEVOXYL, dp 175

slide 52 of 142

Levoxyl

slide 53 of 142, Levoxyl,

200 mcg (0.2 mg), oval, pink, imprinted with LEVOXYL, dp 200

slide 53 of 142

Synthroid

slide 54 of 142, Synthroid,

175 mcg (0.175 mg), round, purple, imprinted with SYNTHROID, 175

slide 54 of 142

Synthroid

slide 55 of 142, Synthroid,

25 mcg (0.025 mg), round, orange, imprinted with SYNTHROID, 25

slide 55 of 142

Synthroid

slide 56 of 142, Synthroid,

50 mcg (0.05 mg), round, white, imprinted with SYNTHROID, 50

slide 56 of 142

Synthroid

slide 57 of 142, Synthroid,

75 mcg (0.075 mg), round, lavender, imprinted with SYNTHROID, 75

slide 57 of 142

Synthroid

slide 58 of 142, Synthroid,

88 mcg (0.088 mg), round, green, imprinted with SYNTHROID, 88

slide 58 of 142

Synthroid

slide 59 of 142, Synthroid,

100 mcg (0.1 mg), round, yellow, imprinted with SYNTHROID, 100

slide 59 of 142

Synthroid

slide 60 of 142, Synthroid,

125 mcg (0.125 mg), round, beige, imprinted with SYNTHROID, 125

slide 60 of 142

Synthroid

slide 61 of 142, Synthroid,

150 mcg (0.15 mg), round, blue, imprinted with SYNTHROID, 150

slide 61 of 142

Synthroid

slide 62 of 142, Synthroid,

200 mcg (0.2 mg), round, pink, imprinted with SYNTHROID, 200

slide 62 of 142

Synthroid

slide 63 of 142, Synthroid,

112 mcg (0.112 mg), round, pink, imprinted with SYNTHROID, 112

slide 63 of 142

Euthyrox

slide 64 of 142, Euthyrox,

100 mcg (0.1 mg), round, yellow, imprinted with 100 M

slide 64 of 142

Levothroid

slide 65 of 142, Levothroid,

25 mcg (0.025 mg), round, orange, imprinted with LOGO, 25

slide 65 of 142

Levothroid

slide 66 of 142, Levothroid,

50 mcg (0.05 mg), oblong, white, imprinted with T 4, 50

slide 66 of 142

Levothroid

slide 67 of 142, Levothroid,

50 mcg (0.05 mg), round, white, imprinted with LOGO, 50

slide 67 of 142

Levothroid

slide 68 of 142, Levothroid,

75 mcg (0.075 mg), oblong, lavender, imprinted with T 4, 75

slide 68 of 142

Levothroid

slide 69 of 142, Levothroid,

75 mcg (0.075 mg), round, gray, imprinted with LOGO, 75

slide 69 of 142

Levothroid

slide 70 of 142, Levothroid,

88 mcg (0.088 mg), oblong, green, imprinted with T 4, 88

slide 70 of 142

Levothroid

slide 71 of 142, Levothroid,

88 mcg (0.088 mg), round, green, imprinted with LOGO, 88

slide 71 of 142

Levothroid

slide 72 of 142, Levothroid,

100 mcg (0.1 mg), oblong, yellow, imprinted with T 4, 100

slide 72 of 142

Levothroid

slide 73 of 142, Levothroid,

100 mcg (0.1 mg), round, yellow, imprinted with LOGO, 100

slide 73 of 142

Levothroid

slide 74 of 142, Levothroid,

112 mcg (0.112 mg), oblong, pink, imprinted with T 4, 112

slide 74 of 142

Levothroid

slide 75 of 142, Levothroid,

112 mcg (0.112 mg), round, pink, imprinted with LOGO, 112

slide 75 of 142

Levothroid

slide 76 of 142, Levothroid,

125 mcg (0.125 mg), oblong, brown, imprinted with T4, 125

slide 76 of 142

Levothroid

slide 77 of 142, Levothroid,

125 mcg (0.125 mg), round, purple, imprinted with LOGO, 125

slide 77 of 142

Levothroid

slide 78 of 142, Levothroid,

137 mcg (0.137 mg), round, blue, imprinted with LOGO, 137

slide 78 of 142

Levothroid

slide 79 of 142, Levothroid,

150 mcg (0.15 mg), oval, blue, imprinted with T 4, 150

slide 79 of 142

Levothroid

slide 80 of 142, Levothroid,

150 mcg (0.15 mg), round, blue, imprinted with LOGO, 150

slide 80 of 142

Levothroid

slide 81 of 142, Levothroid,

175 mcg (0.175 mg), oblong, lavender, imprinted with T 4, 175

slide 81 of 142

Levothroid

slide 82 of 142, Levothroid,

175 mcg (0.175 mg), round, turquoise, imprinted with LOGO, 175

slide 82 of 142

Levothroid

slide 83 of 142, Levothroid,

200 mcg (0.2 mg), oblong, pink, imprinted with T 4, 200

slide 83 of 142

Levothroid

slide 84 of 142, Levothroid,

200 mcg (0.2 mg), round, pink, imprinted with LOGO, 200

slide 84 of 142

Levothroid

slide 85 of 142, Levothroid,

300 mcg (0.3 mg), oblong, green, imprinted with T 4, 300

slide 85 of 142

Levothroid

slide 86 of 142, Levothroid,

300 mcg (0.3 mg), round, green, imprinted with LOGO, 300

slide 86 of 142

Levothyroxine Sodium

slide 87 of 142, Levothyroxine Sodium,

25 mcg (0.025 mg), oblong, peach, imprinted with M, L 4

slide 87 of 142

Levothyroxine Sodium

slide 88 of 142, Levothyroxine Sodium,

50 mcg (0.05 mg), oblong, white, imprinted with M, L 5

slide 88 of 142

Levothyroxine Sodium

slide 89 of 142, Levothyroxine Sodium,

50 mcg (0.05 mg), round, white, imprinted with 3912 V

slide 89 of 142

Levothyroxine Sodium

slide 90 of 142, Levothyroxine Sodium,

75 mcg (0.075 mg), oblong, gray, imprinted with M, L 6

slide 90 of 142

Levothyroxine Sodium

slide 91 of 142, Levothyroxine Sodium,

88 mcg (0.088 mg), oblong, green, imprinted with M, L 7

slide 91 of 142

Levothyroxine Sodium

slide 92 of 142, Levothyroxine Sodium,

100 mcg (0.1 mg), oblong, yellow, imprinted with M, L 8

slide 92 of 142

Levothyroxine Sodium

slide 93 of 142, Levothyroxine Sodium,

100 mcg (0.1 mg), round, yellow, imprinted with 3914 V

slide 93 of 142

Levothyroxine Sodium

slide 94 of 142, Levothyroxine Sodium,

125 mcg (0.125 mg), oblong, beige, imprinted with M, L 10

slide 94 of 142

Levothyroxine Sodium

slide 95 of 142, Levothyroxine Sodium,

125 mcg (0.125 mg), round, peach, imprinted with 3919 V

slide 95 of 142

Levothyroxine Sodium

slide 96 of 142, Levothyroxine Sodium,

150 mcg (0.15 mg), capsule, blue, imprinted with M, L 11

slide 96 of 142

Levothyroxine Sodium

slide 97 of 142, Levothyroxine Sodium,

150 mcg (0.15 mg), round, blue, imprinted with 3915 V

slide 97 of 142

Levothyroxine Sodium

slide 98 of 142, Levothyroxine Sodium,

175 mcg (0.175 mg), oblong, lavender, imprinted with M, L 12

slide 98 of 142

Levothyroxine Sodium

slide 99 of 142, Levothyroxine Sodium,

200 mcg (0.2 mg), oblong, red, imprinted with M, L 13

slide 99 of 142

Levothyroxine Sodium

slide 100 of 142, Levothyroxine Sodium,

200 mcg (0.2 mg), round, pink, imprinted with 3915 V

slide 100 of 142

Levothyroxine Sodium

slide 101 of 142, Levothyroxine Sodium,

300 mcg (0.3 mg), oblong, dark green, imprinted with M, L 14

slide 101 of 142

Levoxyl

slide 102 of 142, Levoxyl,

25 mcg (0.025 mg), peanut, orange, imprinted with LEVOXYL, dp 25

slide 102 of 142

Levoxyl

slide 103 of 142, Levoxyl,

50 mcg (0.05 mg), peanut, white, imprinted with LEVOXYL, dp 59, dp 50

slide 103 of 142

Levoxyl

slide 104 of 142, Levoxyl,

75 mcg (0.075 mg), oval, purple, imprinted with LEVOXYL, dp 75

slide 104 of 142

Levoxyl

slide 105 of 142, Levoxyl,

88 mcg (0.088 mg), oval, green, imprinted with LEVOXYL, dp 88

slide 105 of 142

Levoxyl

slide 106 of 142, Levoxyl,

150 mcg (0.15 mg), oval, blue, imprinted with LEVOXYL, dp 150

slide 106 of 142

Levoxyl

slide 107 of 142, Levoxyl,

175 mcg (0.175 mg), oval, turquoise, imprinted with LEVOXYL, dp 175

slide 107 of 142

Levoxyl

slide 108 of 142, Levoxyl,

300 mcg (0.3 mg), oval, green, imprinted with LEVOXYL, dp 300

slide 108 of 142

Levoxyl

slide 109 of 142, Levoxyl,

100 mcg (0.1 mg), oval, yellow, imprinted with LEVOXYL, dp 100

slide 109 of 142

Levoxyl

slide 110 of 142, Levoxyl,

112 mcg (0.112 mg), oval, pink, imprinted with LEVOXYL, dp 112

slide 110 of 142

Levoxyl

slide 111 of 142, Levoxyl,

125 mcg (0.125 mg), oval, brown, imprinted with LEVOXYL, dp 125

slide 111 of 142

Levoxyl

slide 112 of 142, Levoxyl,

137 mcg (0.137 mg), oval, blue, imprinted with LEVOXYL, dp 137

slide 112 of 142

Levoxyl

slide 113 of 142, Levoxyl,

200 mcg (0.2 mg), oval, pink, imprinted with LEVOXYL, dp 200

slide 113 of 142

Synthroid

slide 114 of 142, Synthroid,

25 mcg (0.025 mg), round, orange, imprinted with SYNTHROID, 25

slide 114 of 142

Synthroid

slide 115 of 142, Synthroid,

25 mcg (0.025 mg), round, orange, imprinted with FLINT, 25

slide 115 of 142

Synthroid

slide 116 of 142, Synthroid,

50 mcg (0.05 mg), round, white, imprinted with SYNTHROID, 50

slide 116 of 142

Synthroid

slide 117 of 142, Synthroid,

50 mcg (0.05 mg), round, white, imprinted with FLINT, 50

slide 117 of 142

Synthroid

slide 118 of 142, Synthroid,

75 mcg (0.075 mg), round, lavender, imprinted with SYNTHROID, 75

slide 118 of 142

Synthroid

slide 119 of 142, Synthroid,

75 mcg (0.075 mg), round, lavender, imprinted with FLINT, 75

slide 119 of 142

Synthroid

slide 120 of 142, Synthroid,

88 mcg (0.088 mg), round, green, imprinted with SYNTHROID, 88

slide 120 of 142

Synthroid

slide 121 of 142, Synthroid,

88 mcg (0.088 mg), round, green, imprinted with FLINT, 88

slide 121 of 142

Synthroid

slide 122 of 142, Synthroid,

100 mcg (0.1 mg), round, yellow, imprinted with SYNTHROID, 100

slide 122 of 142

Synthroid

slide 123 of 142, Synthroid,

100 mcg (0.1 mg), round, yellow, imprinted with FLINT, 100

slide 123 of 142

Synthroid

slide 124 of 142, Synthroid,

112 mcg (0.112 mg), round, pink, imprinted with SYNTHROID, 112

slide 124 of 142

Synthroid

slide 125 of 142, Synthroid,

112 mcg (0.112 mg), round, pink, imprinted with FLINT, 112

slide 125 of 142

Synthroid

slide 126 of 142, Synthroid,

125 mcg (0.125 mg), round, beige, imprinted with SYNTHROID, 125

slide 126 of 142

Synthroid

slide 127 of 142, Synthroid,

125 mcg (0.125 mg), round, beige, imprinted with FLINT, 125

slide 127 of 142

Synthroid

slide 128 of 142, Synthroid,

137 mcg (0.137 mg), round, blue, imprinted with SYNTHROID, 137

slide 128 of 142

Synthroid

slide 129 of 142, Synthroid,

150 mcg (0.15 mg), round, blue, imprinted with SYNTHROID, 150

slide 129 of 142

Synthroid

slide 130 of 142, Synthroid,

150 mcg (0.15 mg), round, blue, imprinted with FLINT, 150

slide 130 of 142

Synthroid

slide 131 of 142, Synthroid,

175 mcg (0.175 mg), round, purple, imprinted with SYNTHROID, 175

slide 131 of 142

Synthroid

slide 132 of 142, Synthroid,

175 mcg (0.175 mg), round, purple, imprinted with FLINT, 175

slide 132 of 142

Synthroid

slide 133 of 142, Synthroid,

200 mcg (0.2 mg), round, pink, imprinted with SYNTHROID, 200

slide 133 of 142

Synthroid

slide 134 of 142, Synthroid,

200 mcg (0.2 mg), round, pink, imprinted with FLINT, 200

slide 134 of 142

Synthroid

slide 135 of 142, Synthroid,

300 mcg (0.3 mg), round, green, imprinted with SYNTHROID, 300

slide 135 of 142

Unithroid

slide 136 of 142, Unithroid,

25 mcg (0.025 mg), round, orange, imprinted with JSP, 513

slide 136 of 142

Unithroid

slide 137 of 142, Unithroid,

88 mcg (0.088 mg), round, green, imprinted with JSP, 561

slide 137 of 142

Levothyroxine Sodium

slide 138 of 142, Levothyroxine Sodium,

100 mcg (0.1 mg), round, yellow, imprinted with JSP, 516

slide 138 of 142

Unithroid

slide 139 of 142, Unithroid,

112 mcg (0.112 mg), round, pink, imprinted with JSP, 562

slide 139 of 142

Levothyroxine Sodium

slide 140 of 142, Levothyroxine Sodium,

150 mcg (0.15 mg), round, blue, imprinted with JSP, 520

slide 140 of 142

Unithroid

slide 141 of 142, Unithroid,

175 mcg (0.175 mg), round, lavender, imprinted with JSP, 563

slide 141 of 142

Unithroid

slide 142 of 142, Unithroid,

300 mcg (0.3 mg), round, green, imprinted with JSP, 523

slide 142 of 142

What is the most important information I should know about levothyroxine?

You may not be able to use levothyroxine if you have certain medical conditions. Tell your doctor if you have an untreated or uncontrolled adrenal gland disorder, a thyroid disorder called thyrotoxicosis, or if you have any recent or current symptoms of a heart attack.

Levothyroxine should not be used to treat obesity or weight problems.

What is levothyroxine?

Levothyroxine is used to treat hypothyroidism (low thyroid hormone). Levothyroxine is given when your thyroid does not produce enough of this hormone on its own.

Levothyroxine is also used to treat or prevent goiter (enlarged thyroid gland), which can be caused by hormone imbalances, radiation treatment, surgery, or cancer.

There are many brands and forms of levothyroxine available. Not all brands are listed on this leaflet.

Levothyroxine may also be used for purposes not listed in this medication guide.

What should I discuss with my healthcare provider before using levothyroxine?

Levothyroxine should not be used to treat obesity or weight problems. Dangerous side effects or death can occur from the misuse of levothyroxine, especially if you are taking any other weight-loss medications or appetite suppressants.

Since thyroid hormone occurs naturally in the body, almost anyone can use levothyroxine. However, you may not be able to use this medicine if you have certain medical conditions. Tell your doctor if you have:

an untreated or uncontrolled adrenal gland disorder;
a thyroid disorder called thyrotoxicosis; or
symptoms of a heart attack (chest pain or heavy feeling, pain spreading to the jaw or shoulder, nausea, sweating, general ill feeling).

Tell your doctor if you have ever had:

a thyroid nodule;
heart disease, a blood clot, or a blood-clotting disorder;
diabetes (insulin or oral diabetes medication doses may need to be changed when you start using levothyroxine);
kidney disease;
anemia (lack of red blood cells);
osteoporosis, or low bone mineral density;
problems with your pituitary gland; or
any food or drug allergies.

Tell your doctor if you have recently received radiation therapy with iodine (such as I-131).

If you become pregnant while using levothyroxine, do not stop using the medicine without your doctor's advice. Having low thyroid hormone levels during pregnancy could harm both mother and baby. Your dose needs may be different during pregnancy.

Tell your doctor if you are breastfeeding. Your dose needs may be different while you are nursing.

Do not give this medicine to a child without medical advice. Tirosint is not approved for use by anyone younger than 6 years old.

How should I use levothyroxine?

Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.

Levothyroxine oral is taken by mouth. Levothyroxine injection is given as an infusion into a vein. Levothyroxine is usually given by injection only if you are unable to take the medicine by mouth.

Levothyroxine oral works best if you take it on an empty stomach, 30 to 60 minutes before breakfast. Follow your doctor's dosing instructions and try to take the medicine at the same time each day.

Swallow the tablet or capsule whole, with a full glass (8 ounces) of water. The levothyroxine tablet may dissolve very quickly and could swell in your throat.

Measure liquid medicine carefully. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon).

Levothyroxine doses are based on weight in children. Your child's dose needs may change if the child gains or loses weight.

It may take several weeks before your body starts to respond to levothyroxine. Keep using this medicine even if you feel well. You may need to use levothyroxine for the rest of your life.

You may need frequent medical tests. Tell any doctor, dentist, or surgeon who treats you that you are using levothyroxine.

Store at room temperature away from moisture and heat. Use Tirosint-Sol within 3 months after opening the pouch.

Do not share this medicine with another person, even if they have the same symptoms you have.

What happens if I miss a dose?

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Overdose symptoms may include headache, leg cramps, tremors, feeling nervous or irritable, chest pain, shortness of breath, and fast or pounding heartbeats.

What should I avoid while using levothyroxine?

What are the possible side effects of levothyroxine?

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

fast or irregular heartbeats;
chest pain, pain spreading to your jaw or shoulder;
shortness of breath;
fever, hot flashes, sweating;
tremors, or if you feel unusually cold;
weakness, tiredness, sleep problems (insomnia);
memory problems, feeling depressed or irritable;
headache, leg cramps, muscle aches;
feeling nervous or irritable;
dryness of your skin or hair, hair loss;
irregular menstrual periods; or
vomiting, diarrhea, appetite changes, weight changes.

Certain side effects may be more likely in older adults.

Common side effects may include:

chest pain, irregular heartbeats;
shortness of breath;
headache, leg cramps, muscle pain or weakness;
tremors, feeling nervous or irritable, trouble sleeping;
increased appetite;
feeling hot;
weight loss;
changes in your menstrual periods;
diarrhea; or
skin rash, partial hair loss.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What other drugs will affect levothyroxine?

Many other medicines can be affected by your thyroid hormone levels. Certain other medicines may also increase or decrease the effects of levothyroxine.

If you use any of the following drugs, avoid taking them within 4 hours before or 4 hours after you use levothyroxine:

calcium carbonate (Alka-Mints, Caltrate, Os-Cal, Oyster Shell Calcium, Rolaids Soft Chew, Tums, and others);
cholestyramine, colesevelam, colestipol;
ferrous sulfate iron supplement;
sucralfate;
sodium polystyrene sulfonate (Kalexate, Kayexalate, Kionex);
stomach acid reducers --esomeprazole, lansoprazole, omeprazole, rabeprazole, Nexium, Prilosec, Prevacid, Protonix, Zegerid, and others; or
antacids that contain aluminum or magnesium --Gaviscon, Maalox, Milk of Magnesia, Mintox, Mylanta, Pepcid Complete, and others.

Many drugs can affect levothyroxine. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed here. Tell your doctor about all your current medicines and any medicine you start or stop using.

Where can I get more information?

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.

Copyright 1996-2023 Cerner Multum, Inc. Version: 16.01. Revision date: 4/20/2022.

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This information does not replace the advice of a doctor. Healthwise, Incorporated, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of UseTerms of Use. Learn how we develop our contenthow we develop our content.

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