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Thyroid Health
Thyroid tablets for an underactive or overactive thyroid: levothyroxine and liothyronine to replace the hormone, carbimazole and methimazole to lower its output, with generic and branded listings.
Levothyroxine
25/50/75/100/125/200mcg
Levothyroxine tablets replace the thyroid hormone missing in an underactive thyroid, in six strengths from 25mcg to 200mcg and packs of 100 to 400 tablets.
Liothyronine
20/25mcg
Liothyronine 20mcg and 25mcg tablets, a synthetic form of the thyroid hormone T3 used for hypothyroidism (underactive thyroid). Packs contain 100 tablets.
Carbimazole
5/10mg
NeoMercazole is a carbimazole tablet for an overactive thyroid (hyperthyroidism). It comes as generic 5mg and 10mg tablets in packs of 130 or 260.
Tiredness, weight gain, feeling cold and a slow heartbeat are the pattern behind most searches for levothyroxine. Levothyroxine is the synthetic version of T4, the main hormone the thyroid makes, and this page lists it twice: as Levothyroxine and as Synthroid, each in 25, 50, 75, 100, 125 and 200mcg tablets. Strengths are spread this finely because the right amount is found by adjusting in small steps against a TSH blood test, which measures how hard the pituitary gland is pushing the thyroid. Most people take it long term, once a day with water on an empty stomach before breakfast, and calcium, iron and antacids are kept several hours away because they block absorption.
Liothyronine is T3, the form the body actually uses. It acts faster and wears off sooner than T4, so it is listed for hypothyroidism where levothyroxine alone has not done enough. The range is Liothyronine, also sold as Cytomel, in 20mcg and 25mcg tablets.
A racing heart, tremor, heat intolerance and weight loss despite eating well are the signs of an overactive thyroid, and the tablets here reduce how much hormone the gland makes. Carbimazole is listed as NeoMercazole in 5mg and 10mg tablets. Methimazole, sold as Tapazole (also listed as plain methimazole) in the same 5mg and 10mg, is the active form: carbimazole is converted to methimazole in the body, so the two work the same way and differ in name and, in many countries, in which one is on the shelf.
These antithyroid tablets take weeks to bring hormone levels down, as the gland has stored hormone to use up first, and a course usually runs 12 to 18 months before the dose is reviewed. A skin rash is a common early reaction. A sudden sore throat or fever while taking either one points to a rare fall in white blood cells and needs a blood count the same day.
Underactive and overactive thyroid call for opposite medicines, so the two groups are not alternatives to each other. Levothyroxine and liothyronine add hormone; carbimazole and methimazole take it away. Each pair has a brand-and-generic twin, Synthroid beside Levothyroxine and Tapazole, which is also sold as plain Methimazole, with matching strengths, so within a pair the only difference is the name on the pack. Strength is the other thing to match: levothyroxine runs from 25mcg to 200mcg, while liothyronine, which is stronger microgram for microgram, sits at 20mcg and 25mcg.
For an underactive thyroid, PockDose sells levothyroxine 25 to 200mcg and generic Synthroid in the same strengths. For an overactive thyroid, there is carbimazole 5/10mg, generic NeoMercazole, methimazole 5/10mg (generic Tapazole). All are tablets.
Levothyroxine is for an underactive thyroid and comes as 25 to 200mcg tablets, with generic Synthroid in the same strengths. Carbimazole and methimazole are for an overactive thyroid at 5/10mg, with generic NeoMercazole and generic Tapazole.
Orders arrive in plain, unbranded packaging. Tracked courier takes 5–9 business days; standard airmail takes 14–21 business days and is untracked. See delivery and ordering details.
Both contain levothyroxine and both are listed here in 25mcg to 200mcg tablets, so the ingredient and the strengths match. Synthroid is the brand name, and the plain listing is the generic.
Carbimazole is turned into methimazole once swallowed, so methimazole is the active form. Both come as 5mg and 10mg tablets here and both are used for an overactive thyroid.
Liothyronine is T3, the active hormone, and acts faster but wears off sooner. Levothyroxine is T4, which the body converts to T3, and it lasts long enough for one dose a day.
Yes, the dose is set by TSH and thyroid hormone blood tests, repeated every few weeks at first and then roughly once a year once levels are steady. The strengths on offer cover that step-by-step adjustment.