Active Ingredients A to Z

Every branded generic we stock, organised by active ingredient, so you can find the affordable alternative to any big-name original. The brand changes; the active ingredient does not.

Imatinib Imatinib is a targeted cancer drug used mainly for chronic myeloid leukemia and gastrointestinal stromal tumors; it blocks a specific abnormal growth signal and requires regular blood counts and liver checks throughout treatment. 1 medicine View Imatinib Imipramine Imipramine is a tricyclic antidepressant for depression, panic disorder, and childhood bedwetting; it is highly toxic in overdose and can cause fatal heart rhythm disturbances, so it must never be combined with an MAOI. 1 medicine View Imipramine Imiquimod Imiquimod is a topical immune-response cream for genital warts, actinic keratosis, and superficial skin cancer; it commonly causes strong local skin reactions, which are expected but can require a treatment break. 1 medicine View Imiquimod Indapamide Indapamide is a thiazide-like diuretic for high blood pressure and fluid retention; it can cause low sodium and potassium levels, especially in older adults, so electrolytes need regular blood tests. 1 medicine View Indapamide Indometacin Indometacin is a potent NSAID used for arthritis, gout and other inflammatory pain; it carries a higher risk than most NSAIDs of stomach bleeding, heart attack, stroke, headache and dizziness, and must be avoided late in pregnancy. 1 medicine View Indometacin Ipratropium Ipratropium is an anticholinergic bronchodilator inhaled to relieve wheezing and breathlessness in asthma and COPD. Keep the spray or mist away from your eyes, since contact can trigger a sudden painful rise in eye pressure. 1 medicine View Ipratropium Ipratropium Bromide Ipratropium bromide is an inhaled anticholinergic bronchodilator used for regular maintenance treatment of COPD and asthma. It is not a rescue inhaler, and the spray must be kept away from the eyes because it can trigger acute angle-closure glaucoma. 1 medicine View Ipratropium Bromide Irbesartan Irbesartan is an ARB that relaxes blood vessels to treat high blood pressure and protect the kidneys in type 2 diabetes. It must be stopped if you become pregnant, since it can seriously harm an unborn baby. 1 medicine View Irbesartan Isosorbide Isosorbide is a nitrate that widens blood vessels to relieve and prevent angina chest pain. It must never be combined with PDE5 inhibitors such as sildenafil or with riociguat, because together they cause a dangerous drop in blood pressure. 1 medicine View Isosorbide Isosorbide Dinitrate Isosorbide dinitrate is a nitrate that relaxes blood vessels to prevent and relieve angina. It must never be combined with PDE5 inhibitors such as sildenafil or with riociguat, which can cause a dangerous drop in blood pressure. 1 medicine View Isosorbide Dinitrate Isosorbide Mononitrate Isosorbide mononitrate is a long-acting nitrate that prevents angina by relaxing blood vessels. It must never be combined with PDE5 inhibitors such as sildenafil or with riociguat, which can cause a dangerous drop in blood pressure. 1 medicine View Isosorbide Mononitrate Isotretinoin Isotretinoin is an oral retinoid for severe acne that causes serious birth defects in pregnancy, so anyone who could become pregnant must use two forms of contraception and have regular pregnancy tests throughout treatment. 3 medicines View Isotretinoin Itraconazole Itraconazole is an azole antifungal used for nail, skin and invasive fungal infections. It is contraindicated in heart failure because it can weaken the heart's pumping action, and it carries a risk of serious liver injury. 1 medicine View Itraconazole Ivabradine Ivabradine slows a fast heart rate in chronic heart failure and angina by acting on the heart's natural pacemaker. It only works in normal sinus rhythm and can trigger atrial fibrillation, so an irregular heartbeat needs prompt review. 1 medicine View Ivabradine Ivermectin Ivermectin is an antiparasitic medicine used for specific worm and mite infections such as strongyloidiasis, onchocerciasis and scabies. It is not an approved or effective treatment for COVID-19 or other viral infections, and animal formulations are dangerous for people. 1 medicine View Ivermectin