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.

Rabeprazole Rabeprazole is a proton pump inhibitor that reduces stomach acid to treat reflux and ulcers; long-term use needs the lowest effective dose because of risks like fracture, low magnesium, and vitamin B12 deficiency. 1 medicine View Rabeprazole Raloxifene Raloxifene is a selective estrogen receptor modulator used to prevent and treat osteoporosis; it carries a boxed warning for increased risk of blood clots and fatal stroke. 1 medicine View Raloxifene Raltegravir Raltegravir is an HIV integrase inhibitor always used together with other antiretroviral medicines; it can rarely cause severe muscle breakdown (rhabdomyolysis). 2 medicines View Raltegravir Ramipril Ramipril is an ACE inhibitor for high blood pressure and heart failure; it must be stopped in pregnancy and can cause angioedema (throat and facial swelling) or high potassium. 2 medicines View Ramipril Ranitidine Ranitidine is an H2 blocker that reduces stomach acid to treat reflux and ulcers. It has been withdrawn or recalled in many countries because of contamination with NDMA, a probable carcinogen, and alternatives are usually preferred. 1 medicine View Ranitidine Ranolazine Ranolazine treats chronic angina by helping the heart work more efficiently; it prolongs the QT interval and interacts seriously with CYP3A4 inhibitors and inducers. 1 medicine View Ranolazine Repaglinide Repaglinide is a fast-acting oral medicine that stimulates the pancreas to release insulin with meals, lowering blood sugar in type 2 diabetes. Because it works by triggering insulin release, skipping a meal after taking a dose can cause dangerous low blood sugar. 1 medicine View Repaglinide Ribavirin Ribavirin is an antiviral used with other medicines for hepatitis C and for severe RSV infection. It is a severe teratogen, so both partners must avoid pregnancy during treatment and for 6 months afterward. 2 medicines View Ribavirin Rifampicin Rifampicin is a tuberculosis antibiotic and potent liver enzyme inducer that reduces the effectiveness of many other drugs, including hormonal contraceptives, and can harm the liver. 1 medicine View Rifampicin Rifaximin Rifaximin is a poorly absorbed gut-specific antibiotic used for travelers' diarrhea, IBS with diarrhea, and hepatic encephalopathy. It should not be used for diarrhea with fever or blood in the stool, since that points to an infection it cannot treat. 1 medicine View Rifaximin Risperidone Risperidone is an atypical antipsychotic used for schizophrenia, bipolar mania and autism-related irritability. It raises prolactin more than most other antipsychotics and is also available as a long-acting injection. 2 medicines View Risperidone Ritonavir Ritonavir is an antiviral used at low doses to boost other HIV and COVID-19 medicines by blocking the liver enzyme that breaks them down. This creates extensive drug interactions, and combining it with many common medicines is dangerous or contraindicated. 1 medicine View Ritonavir Rivaroxaban Rivaroxaban is a direct oral anticoagulant (DOAC) that prevents and treats blood clots by blocking factor Xa, and stopping it suddenly sharply raises your risk of a clot. 1 medicine View Rivaroxaban Rivastigmine Rivastigmine is a cholinesterase inhibitor used for dementia in Alzheimer's and Parkinson's disease. It can slow the heart rate and cause gastrointestinal effects, and old transdermal patches must be removed before a new one is applied to avoid overdose. 1 medicine View Rivastigmine Rizatriptan Rizatriptan is a triptan that narrows blood vessels to stop a migraine attack. Because it constricts arteries, it must be avoided in people with coronary artery disease, uncontrolled high blood pressure, or a history of stroke. 1 medicine View Rizatriptan Roflumilast Roflumilast is a PDE4 inhibitor used to reduce flare-ups in severe COPD with chronic bronchitis. It can cause mood changes, including suicidal thinking, and noticeable weight loss, so mental health and weight need monitoring during treatment. 1 medicine View Roflumilast Ropinirole Ropinirole is a dopamine agonist used for Parkinson's disease and restless legs syndrome. It can cause sudden, unannounced sleep attacks and impulse control problems such as compulsive gambling, shopping, or sexual behavior, which should be reported to a doctor immediately. 1 medicine View Ropinirole Rosuvastatin Rosuvastatin is a statin that lowers LDL cholesterol to reduce the risk of heart attack and stroke. It rarely causes rhabdomyolysis, serious muscle breakdown, which shows up as muscle pain or weakness with dark urine. 2 medicines View Rosuvastatin Roxithromycin Roxithromycin is a macrolide antibiotic used for bacterial respiratory, skin and soft-tissue infections. It can prolong the heart's QT interval, so it should not be combined with other medicines that affect heart rhythm. 1 medicine View Roxithromycin