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Thyroid USP

What Should I Do If I Miss a Dose of Thyroid USP?

If you forget to take your thyroid USP dose, take your missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not take a double dose. Each time you get your blood tests to monitor your thyroid function, be sure to tell your healthcare provider if you have missed any doses, as this may affect dose adjustments.

Available Strengths

Thyroid USP tablets come in several different strengths. Sometimes, the strengths are listed in milligrams; sometimes, they are listed in grains (an outdated measurement). This can be a problem, since there is no agreement about exactly how many milligrams are in a grain. For instance, a 1-grain Armour Thyroid tablet contains 60 mg, while a 1-grain Nature-Throid tablet contains 65 mg.
For this reason, it is important to know the strength of your thyroid USP product in milligrams, not just in grains. Thyroid USP tablets are available in the following strengths:
  • Thyroid USP ¼ grain (15 to 16.25 mg, depending on the particular product)
  • Thyroid USP ½ grain (30 to 32.5 mg)
  • Thyroid USP 1 grain (60 to 65 mg)
  • Thyroid USP 1½ grain (90 to 97.5 mg)
  • Thyroid USP 2 grain (120 to 130 mg)
  • Thyroid USP 3 grain (180 to 195 mg)
  • Thyroid USP 4 grain (240 to 260 mg)
  • Thyroid USP 5 grain (300 to 325 mg).
It is difficult to tell if different thyroid USP products are equivalent to each other (see Generic Armour Thyroid, Generic Nature-Throid, or Generic Westhroid for more information).
Last reviewed by: Kristi Monson, PharmD
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