Prostaglandin E1 (PGE1)
Alprostadil 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 Alprostadil (Alprostadil), enough to matter clinically at 10mcg, 20mcg, 40mcg.
How smoking affects Alprostadil
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 Alprostadil is affected depends on its specific metabolic pathway. Alprostadil binds prostaglandin E receptors on smooth muscle of the corpus cavernosum, triggering cAMP-mediated relaxation of cavernosal smooth muscle independent of the nitric oxide pathway used by P…
Practical guidance
According to the prescribing information for Alprostadil, smoking status should be disclosed at every dose review of Alprostadil. 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 10mcg, 20mcg, 40mcg starting strength assumed in the prescribing information is usually for non-smokers.
Frequently asked questions
Does smoking change how Alprostadil works? ▾
For medications metabolised by CYP1A2, yes — smokers may need higher doses or have reduced effect at standard 10mcg, 20mcg, 40mcg. Whether Alprostadil specifically is affected depends on whether Alprostadil uses CYP1A2. The prescribing information notes any documented interaction.
Will I need to adjust Alprostadil if I quit smoking? ▾
Possibly, if Alprostadil 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 Alprostadil
More on Alprostadil
- With alcoholAlprostadil and alcohol — is it safe to drink?
- With foodShould Alprostadil be taken with food?
- Side effectsAlprostadil side effects: common, rare and warning signs
- Dosage guideAlprostadil dosage guide: how much to take and when
- OnsetHow fast does Alprostadil start working?
- DurationHow long does Alprostadil last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.