allopurinol vs prazosin
Side-by-side comparison of allopurinol and prazosin. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
minor Known Drug Interaction
Drug Interactions Prazosin hydrochloride has been administered without any adverse drug interaction in limited clinical experience to date with the following: (1) cardiac glycosides– digitalis and digoxin; (2) hypoglycemics–insulin, chlorpropamide, phenformin, tolazamide, and tolbutamide; (3) tranquilizers and sedatives–chlordiazepoxide, diazepam, and phenobarbital; (4) antigout– allopurinol, colchicine, and probenecid; (5) antiarrhythmics–procainamide, propranolol ( see WARNINGS however), and quinidine; and (6) analgesics, antipyretics and anti-inflammatories– propoxyphene, aspirin,...
Recommendation: You can continue to take both of these medicines as prescribed by your doctor.
Zyloprim
Minipress
Allopurinol is a medicine that lowers uric acid levels in your body. It helps prevent gout attacks and other problems caused by high uric acid.
Prazosin (Minipress) is a medicine that lowers your blood pressure. Lowering blood pressure helps prevent strokes and heart attacks.
This medicine is used to manage gout in adults. Gout causes painful attacks, joint damage, and kidney problems. Allopurinol is also used in adults and children with leukemia, lymphoma, and solid tumors who are getting cancer treatment. It helps manage high uric acid caused by the cancer treatment. It can also help adults who get calcium oxalate kidney stones often.
Prazosin is used to treat high blood pressure. Lowering your blood pressure reduces your risk of serious heart problems. It can be used alone or with other blood pressure medicines. Managing high blood pressure should include healthy habits like diet and exercise.
Allopurinol works by blocking an enzyme called xanthine oxidase. This enzyme helps your body make uric acid. By blocking it, allopurinol reduces the amount of uric acid in your blood and urine.
Prazosin belongs to a class of drugs called alpha-1 blockers. It works by relaxing your blood vessels. This makes it easier for blood to flow through your body, which lowers blood pressure.
- • Diarrhea
- • Nausea
- • Increased liver enzyme levels
- • Gout attacks
- • Skin rash
- • Dizziness
- • Headache
- • Drowsiness
- • Lack of energy
- • Weakness
- Diarrhea 8,423
- Tiredness 7,965
- Difficulty breathing 7,659
- Feeling sick to your stomach 7,061
- Death 6,664
- Feeling sick to your stomach 361
- Head pain 265
- Feeling lightheaded or unsteady 263
- Feeling worried or nervous 260
- Feeling tired 257
Allopurinol can cause serious skin reactions that can be deadly. Stop taking this medicine and get medical help right away if you get a skin rash or any other signs of an allergic reaction.
Prazosin can cause a sudden drop in blood pressure, especially when you first start taking it. This can make you feel dizzy or faint. To avoid this, take your first dose at bedtime. Be careful when standing up quickly.
Allopurinol may harm your unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. It is not recommended to breastfeed while taking this medicine because it can pass into breast milk.
Tell your doctor if you are pregnant or plan to become pregnant. It is not known if prazosin will harm your unborn baby. Talk to your doctor about the risks and benefits of taking prazosin while pregnant or breastfeeding.
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How to Read This allopurinol vs prazosin Comparison
allopurinol is classified in the Xanthine Oxidase Inhibitor drug class, while prazosin sits within the Alpha-1 Blocker class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, allopurinol has 37,772 submissions while prazosin has 1,406. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known minor interaction flagged in FDA labeling, attributed to there is no evidence that these two medications cause problems when taken together.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between allopurinol and prazosin - always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.