Prostaglandin E1 (PGE1)
Alprostadil and cannabis (marijuana, THC)
As cannabis becomes legal or decriminalised in more jurisdictions, the practical question of combining it with prescription medication comes up regularly. Alprostadil (Alprostadil) and cannabis share several pharmacological pathways, and the combination at 10mcg, 20mcg, 40mcg is not automatically benign even where both are legal.
How cannabis affects Alprostadil
THC and other cannabinoids are metabolised partly by hepatic CYP enzymes, including CYP3A4 — the same pathway used by many Prostaglandin E1 (PGE1) medications. Frequent cannabis use can shift the metabolism of Alprostadil mildly. THC also has cardiovascular effects (increased heart rate, blood pressure changes) and central nervous system effects that can stack with Alprostadil's side-effect profile.
Practical guidance
Occasional moderate cannabis use is unlikely to cause clinically meaningful problems for most adults on Alprostadil at 10mcg, 20mcg, 40mcg. Heavy daily use, edibles with high THC content, or cannabis combined with alcohol substantially raise the risk of dizziness, hypotension, impaired judgement and amplified side effects from Alprostadil. According to the prescribing information, the full list of recreational substances should be disclosed to the prescriber.
Frequently asked questions
Can I use cannabis while taking Alprostadil? ▾
For most adults at 10mcg, 20mcg, 40mcg, occasional moderate cannabis is tolerated, but heavy daily use is not advised because of metabolic and additive cardiovascular effects with Alprostadil. The safe practice is to mention it to the prescriber.
Does CBD interact with Alprostadil? ▾
CBD inhibits several CYP enzymes including CYP3A4, which can raise plasma levels of medications that go through that pathway. For Alprostadil specifically, this depends on whether Alprostadil uses CYP3A4. Daily high-dose CBD products warrant a pharmacist check.
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.