Spironolactone drug interactions: a practical overview
Drug interactions are the single biggest cause of preventable medication problems. Spironolactone (Spironolactone) interacts to varying degrees with several classes of medication and with a smaller list of foods. This page summarises the practically important ones at 25mg, 50mg, 100mg, framed for a real-world prescription review rather than an exhaustive PDF list.
High-priority interactions for Spironolactone
For Spironolactone, the most clinically relevant interactions are typically with strong CYP3A4 inhibitors and inducers, with cardiovascular medications (notably nitrates for several Diuretics agents), with central nervous system depressants, and with medications affecting blood pressure or heart rate. Spironolactone competitively blocks the aldosterone (mineralocorticoid) receptor in the distal tubule, reducing sodium reabsorption and potassium excretion.
Working with the pharmacist
A pharmacist review of all current medications is the practical safeguard against unintended interactions with Spironolactone. According to the prescribing information for Spironolactone, the full medication list — prescription, OTC, supplements and recreational substances — should be reviewed before starting and at every dose change at 25mg, 50mg, 100mg.
Frequently asked questions
What's the most important Spironolactone interaction to know? ▾
For most Diuretics medications, the highest-priority interaction is with nitrate medications used for chest pain — this combination is often a hard contraindication. After that, strong CYP3A4 inhibitors (some antifungals, macrolides) are the next concern at routine 25mg, 50mg, 100mg doses.
Do I need to tell the pharmacist about supplements? ▾
Yes. Supplements and herbal products can interact with Spironolactone in ways that prescription drug-drug interaction databases miss. The pharmacist needs the complete picture — including supplements like St John's Wort, grapefruit-containing products and high-dose vitamins — to flag risks at 25mg, 50mg, 100mg.
More on Spironolactone
- With alcoholSpironolactone and alcohol — is it safe to drink?
- With foodShould Spironolactone be taken with food?
- Side effectsSpironolactone side effects: common, rare and warning signs
- Dosage guideSpironolactone dosage guide: how much to take and when
- OnsetHow fast does Spironolactone start working?
- DurationHow long does Spironolactone last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.