Phosphodiesterase type 5 (PDE5) inhibitor
Avanafil and smoking: how tobacco affects the medication
Tobacco smoking is one of the most underappreciated drug-drug interactions in chronic medication. Compounds in tobacco smoke induce hepatic enzymes (especially CYP1A2) and can shift the plasma concentration of many medications, including Avanafil (Avanafil), enough to matter clinically at 50mg, 100mg, 200mg.
How smoking affects Avanafil
Polycyclic aromatic hydrocarbons in tobacco smoke induce CYP1A2 and to a lesser extent other CYP enzymes. For medications metabolised primarily by CYP1A2, smokers can have plasma levels 30–50% lower than non-smokers at the same dose. Whether Avanafil is affected depends on its specific metabolic pathway. Avanafil selectively inhibits phosphodiesterase type 5 (PDE5) in the corpus cavernosum, increasing cGMP and enhancing nitric-oxide-mediated vasodilation in response to sexual stimulation.
Practical guidance
According to the prescribing information for Avanafil, smoking status should be disclosed at every dose review of Avanafil. Stopping smoking can paradoxically raise plasma levels of CYP1A2-metabolised medications enough to cause new-onset side effects within days, and may require a temporary dose reduction. The 50mg, 100mg, 200mg starting strength assumed in the prescribing information is usually for non-smokers.
Frequently asked questions
Does smoking change how Avanafil works? ▾
For medications metabolised by CYP1A2, yes — smokers may need higher doses or have reduced effect at standard 50mg, 100mg, 200mg. Whether Avanafil specifically is affected depends on whether Avanafil uses CYP1A2. The prescribing information notes any documented interaction.
Will I need to adjust Avanafil if I quit smoking? ▾
Possibly, if Avanafil is one of the medications affected by CYP1A2 induction. Stopping smoking restores CYP1A2 to normal within days, raising plasma levels and potentially causing side effects. Discuss the timing of any dose adjustment with the prescriber when planning to quit.
Products containing Avanafil
More on Avanafil
- With alcoholAvanafil and alcohol — is it safe to drink?
- With foodShould Avanafil be taken with food?
- Side effectsAvanafil side effects: common, rare and warning signs
- Dosage guideAvanafil dosage guide: how much to take and when
- OnsetHow fast does Avanafil start working?
- DurationHow long does Avanafil last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.