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.

Naltrexone Naltrexone blocks opioid receptors to treat opioid and alcohol use disorders, but it will trigger sudden withdrawal if you still have opioids in your system, so you must be opioid-free before starting. 2 medicines View Naltrexone Naproxen Naproxen is an NSAID that relieves pain, inflammation, and fever; like other NSAIDs it raises the risk of heart attack, stroke, and serious stomach bleeding, and that risk grows with higher doses, longer use, and existing heart or digestive disease. 3 medicines View Naproxen Nebivolol Nebivolol is a beta-blocker used to treat high blood pressure and, in some countries, heart failure; you must never stop it suddenly, since abrupt withdrawal can trigger rebound high blood pressure, chest pain, or a heart attack. 1 medicine View Nebivolol Nevirapine Nevirapine is an antiretroviral used with other medicines to treat HIV infection. It can cause severe, sometimes fatal liver injury and serious skin reactions, especially in the first weeks, so it is started at a low dose and never restarted after a serious reaction. 1 medicine View Nevirapine Nifedipine Nifedipine is a calcium channel blocker for high blood pressure and angina; short-acting, immediate-release nifedipine must never be used to treat a hypertensive emergency, since the rapid blood-pressure drop it causes has been linked to stroke and heart attack. 2 medicines View Nifedipine Nilotinib Nilotinib is a targeted cancer medicine for chronic myeloid leukemia; it carries a boxed warning for QT-interval prolongation and sudden cardiac death, so you must take it on an empty stomach and avoid other drugs that also prolong the QT interval. 1 medicine View Nilotinib Nimodipine Nimodipine is a calcium channel blocker used after a brain aneurysm bleed (subarachnoid haemorrhage) to protect brain function. It must only be given by mouth: injecting it directly into a vein has caused fatal cardiac arrest. 1 medicine View Nimodipine Nintedanib Nintedanib is a tyrosine kinase inhibitor used to slow lung scarring in pulmonary fibrosis. It can harm an unborn baby, so effective contraception is required during treatment and for three months after the last dose. 1 medicine View Nintedanib Nitrofurantoin Nitrofurantoin is an antibiotic used only for lower urinary tract (bladder) infections, not kidney infections. It should be avoided with poor kidney function or late in pregnancy, and long-term use carries a rare risk of lung and liver damage. 2 medicines View Nitrofurantoin Norethindrone Norethindrone is a progestin used in progestin-only contraceptive pills and to treat abnormal uterine bleeding and endometriosis. Any undiagnosed vaginal bleeding must be checked by a doctor before starting it, and it raises the risk of blood clots. 1 medicine View Norethindrone Norfloxacin Norfloxacin is a fluoroquinolone antibiotic used mainly for urinary tract infections. It carries boxed warnings for tendon rupture, aortic aneurysm or dissection, and nerve damage. 1 medicine View Norfloxacin Norgestrel Norgestrel is a progestin used in oral contraceptives, including the over-the-counter progestin-only pill sold as Opill. Undiagnosed vaginal bleeding must be checked before starting it, and it carries a small increased risk of blood clots. 1 medicine View Norgestrel Nortriptyline Nortriptyline is a tricyclic antidepressant used for depression and nerve pain. It is dangerous in overdose and must never be combined with an MAOI antidepressant without a proper washout period. 1 medicine View Nortriptyline