PDE5 inhibitor
Tadalafil drug interactions: a practical overview
Drug interactions are the single biggest cause of preventable medication problems. Tadalafil (Tadalafil) interacts to varying degrees with several classes of medication and with a smaller list of foods. This page summarises the practically important ones at 20mg, 2.5mg, 5mg, 10mg, framed for a real-world prescription review rather than an exhaustive PDF list.
High-priority interactions for Tadalafil
For Tadalafil, the most clinically relevant interactions are typically with strong CYP3A4 inhibitors and inducers, with cardiovascular medications (notably nitrates for several PDE5 inhibitor agents), with central nervous system depressants, and with medications affecting blood pressure or heart rate. Tadalafil selectively inhibits PDE5, the enzyme responsible for breaking down cyclic guanosine monophosphate in the corpus cavernosum and other vascular smooth muscle.
Working with the pharmacist
A pharmacist review of all current medications is the practical safeguard against unintended interactions with Tadalafil. According to the prescribing information for Tadalafil, the full medication list — prescription, OTC, supplements and recreational substances — should be reviewed before starting and at every dose change at 20mg, 2.5mg, 5mg, 10mg.
Frequently asked questions
What's the most important Tadalafil interaction to know? ▾
For most PDE5 inhibitor 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 20mg, 2.5mg, 5mg, 10mg doses.
Do I need to tell the pharmacist about supplements? ▾
Yes. Supplements and herbal products can interact with Tadalafil 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 20mg, 2.5mg, 5mg, 10mg.
Products containing Tadalafil
More on Tadalafil
- With alcoholTadalafil and alcohol — is it safe to drink?
- With foodShould Tadalafil be taken with food?
- Side effectsTadalafil side effects: common, rare and warning signs
- Dosage guideTadalafil dosage guide: how much to take and when
- OnsetHow fast does Tadalafil start working?
- DurationHow long does Tadalafil last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.