Active Ingredients A to Z

Tacrolimus Tacrolimus is a calcineurin-inhibitor immunosuppressant used to prevent organ-transplant rejection and, as a skin cream, to treat eczema; it raises infection and cancer risk and needs regular blood-level, kidney, and blood-pressure monitoring. 2 medicines View → Tacrolimus Tadalafil Tadalafil is a long-acting PDE5 inhibitor used for erectile dysfunction and an enlarged prostate. It must never be combined with nitrates or riociguat, which can cause a dangerous drop in blood pressure. 24 medicines View → Tadalafil Tamoxifen Tamoxifen is a hormone-blocking drug used to treat and prevent estrogen-receptor-positive breast cancer, but it raises the risk of endometrial cancer and blood clots, so unusual vaginal bleeding needs urgent checking. 1 medicine View → Tamoxifen Tamsulosin Tamsulosin is an alpha-blocker used to ease urinary symptoms of an enlarged prostate. It can cause low blood pressure on standing and floppy iris syndrome during cataract surgery, so surgeons need to know you take it. 2 medicines View → Tamsulosin Tazarotene Tazarotene is a topical retinoid used for acne and plaque psoriasis. It is teratogenic, so it must not be used during pregnancy, and effective contraception is needed if you can become pregnant. 1 medicine View → Tazarotene Telmisartan Telmisartan is an angiotensin receptor blocker (ARB) that lowers blood pressure and eases strain on the heart and kidneys; it must not be taken during pregnancy because it can seriously harm the developing baby. 2 medicines View → Telmisartan Tenofovir Tenofovir is an antiviral used for HIV infection, HIV prevention, and chronic hepatitis B. It can affect kidney function and bone density, so these are monitored during treatment, and hepatitis B can flare up seriously if you stop the drug without medical supervision. 1 medicine View → Tenofovir Tenofovir Disoproxil Tenofovir disoproxil is an antiviral used to treat HIV and chronic hepatitis B and to prevent HIV infection; it can reduce kidney function and bone density, so regular monitoring is required, and stopping it can trigger a severe hepatitis B flare. 3 medicines View → Tenofovir Disoproxil Terazosin Terazosin is an alpha-1 blocker used for high blood pressure and the urinary symptoms of an enlarged prostate; the first dose can cause a sudden drop in blood pressure and fainting, so it is taken at bedtime. 1 medicine View → Terazosin Terbinafine Terbinafine is an antifungal medicine for skin and nail infections that can, in rare cases, cause serious liver injury, so liver function is checked before and during treatment. 1 medicine View → Terbinafine Testosterone Testosterone is the main male sex hormone, prescribed as a gel, injection or patch to treat clinically confirmed low testosterone; it is contraindicated in pregnancy because it can permanently virilize a female fetus. 1 medicine View → Testosterone Tetracycline Tetracycline is a broad-spectrum antibiotic that must be avoided in pregnancy and in children under 8, since it causes permanent tooth discolouration and can affect bone growth. 1 medicine View → Tetracycline Thalidomide Thalidomide is an immunomodulatory medicine used for multiple myeloma and severe leprosy reactions; a single dose taken during pregnancy can cause severe birth defects, so it is dispensed only under a strict pregnancy-prevention program. 1 medicine View → Thalidomide Theophylline Theophylline is a bronchodilator for asthma and COPD with a narrow therapeutic index, so blood levels must be monitored regularly to prevent toxicity. 3 medicines View → Theophylline Thiamazole Thiamazole (methimazole) treats an overactive thyroid but can rarely cause agranulocytosis: any fever or sore throat means stop the medicine and get an urgent blood count, and it should be avoided in the first trimester of pregnancy. 1 medicine View → Thiamazole Ticagrelor Ticagrelor is an antiplatelet medicine that prevents clots after a heart attack or stent by blocking platelets, and it commonly causes breathlessness and must not be combined with high-dose aspirin. 1 medicine View → Ticagrelor Timolol Timolol eye drops lower pressure inside the eye to treat glaucoma; enough of the drug reaches the bloodstream to act like an oral beta-blocker, so it should be avoided in people with asthma or a slow heart rate. 3 medicines View → Timolol Tinidazole Tinidazole is an antibiotic and antiparasitic drug; you must avoid alcohol during treatment and for 72 hours after the last dose to prevent a severe reaction. 1 medicine View → Tinidazole Tiotropium Tiotropium is a long-acting anticholinergic inhaler taken once daily to prevent COPD flare-ups. It does not relieve a sudden asthma or COPD attack, so keep a fast-acting rescue inhaler on hand. 3 medicines View → Tiotropium Tizanidine Tizanidine is a muscle relaxant that must never be combined with fluvoxamine or ciprofloxacin, medicines that can raise its blood levels and cause dangerously low blood pressure. 1 medicine View → Tizanidine Tobramycin Tobramycin is an aminoglycoside antibiotic used as eye drops for eye infections and, by injection or nebulizer, for serious infections. Systemic use can permanently damage hearing and the kidneys, so blood levels and kidney function must be monitored. 2 medicines View → Tobramycin Tolterodine Tolterodine is an anticholinergic medicine for overactive bladder that must be avoided by people with narrow-angle glaucoma or urinary retention, since it can worsen both. 2 medicines View → Tolterodine Tolvaptan Tolvaptan is a vasopressin-receptor blocker used to correct dangerously low blood sodium and slow cyst growth in polycystic kidney disease; it carries a boxed warning for liver injury, and treatment must start in hospital because correcting sodium too quickly can cause serious brain injury. 1 medicine View → Tolvaptan Topiramate Topiramate is an anticonvulsant used for epilepsy and migraine prevention. Taken in pregnancy it raises the risk of cleft lip and palate, and it commonly causes cognitive slowing and kidney stones. 1 medicine View → Topiramate Torsemide Torsemide is a loop diuretic that removes excess fluid but can also flush out potassium and other electrolytes, so blood tests are needed to monitor levels during treatment. 1 medicine View → Torsemide Tranexamic Acid Tranexamic acid stops the body from breaking down blood clots, so it carries a risk of dangerous clotting and should not be used by people with an active clotting disorder. 1 medicine View → Tranexamic Acid Travoprost Travoprost is a prostaglandin eye drop for glaucoma that can permanently darken the iris and the skin around the eye, an effect that does not reverse when treatment stops. 1 medicine View → Travoprost Trazodone Trazodone can rarely cause priapism, a persistent erection lasting more than 4 hours that needs emergency treatment to prevent permanent damage. 1 medicine View → Trazodone Tretinoin Tretinoin is a topical retinoid cream for acne and sun-damaged skin that should be avoided in pregnancy, increases sun sensitivity, and typically causes redness and peeling in the first few weeks of use. 4 medicines View → Tretinoin Triamcinolone Triamcinolone is a corticosteroid used to reduce inflammation in skin, joint, nasal and other conditions. If taken at high doses or for a prolonged period, it must be tapered off gradually rather than stopped abruptly. 1 medicine View → Triamcinolone Trihexyphenidyl Trihexyphenidyl is an anticholinergic medicine used to ease tremor and stiffness in Parkinson's disease and drug-induced movement symptoms. It can trigger acute glaucoma, urinary retention and confusion, especially in older adults. 1 medicine View → Trihexyphenidyl Trimetazidine Trimetazidine is an add-on medicine for stable angina that helps heart muscle use oxygen more efficiently. It can cause or worsen parkinsonian symptoms and tremor, and must be avoided in people with Parkinson's disease. 1 medicine View → Trimetazidine Trimethoprim Trimethoprim is an antibiotic used mainly for urinary tract infections. It blocks folate production, so it must be avoided in early pregnancy, and it can raise blood potassium, especially with other potassium-raising medicines. 1 medicine View → Trimethoprim Tropicamide Tropicamide is an eye drop that dilates the pupil for eye examinations. It causes several hours of blurred vision and light sensitivity, so you should not drive until your sight returns to normal. 1 medicine View → Tropicamide