5-alpha-reductase inhibitor (type II)
Finasteride and CBD — interaction profile and FAQ
Cannabidiol (CBD) is widely used as an over-the-counter wellness product, and many people taking Finasteride (Finasteride) — used for Finasteride is approved at 5mg per day for the treatment of benign prostatic hyperplasia in adult men, where it reduces prostate volume, improves urinary flow and reduces the risk of acute urinary ret… — wonder whether the two are safe to combine. Unlike most herbal products, CBD has documented interactions with several drug-metabolising enzymes, which means it can change blood levels of co-administered medications. Below is a focused look at the Finasteride-and-CBD question at the 1mg dosing strengths.
How CBD can affect Finasteride blood levels
CBD inhibits several cytochrome P450 enzymes — most notably CYP3A4, CYP2C19 and CYP2D6 — which together metabolise a large fraction of prescription medications. Finasteride, with active ingredient Finasteride, may or may not be metabolised by these enzymes; if it is, concomitant CBD can raise Finasteride blood levels and increase the risk of dose-related side effects. Conversely, in some pathways, induction or competition for transporters can lower exposure. The clinically relevant size of this effect depends on the CBD dose, formulation and individual hepatic metabolism.
Practical guidance for combined use
According to general clinical guidance, anyone planning to combine Finasteride at the 1mg doses with regular CBD use should discuss this with the prescriber and ideally check the Finasteride prescribing information and an interaction database (e.g. Lexicomp, the FDA Drug Interactions guidance) for the Finasteride entry. Practical steps include starting at low CBD doses, separating CBD and Finasteride doses by several hours where feasible and monitoring for side effects (sedation, dizziness, gastrointestinal symptoms or laboratory changes) during the first weeks. Pure isolate CBD has fewer co-formulants but the CYP-inhibition signal is similar.
Frequently asked questions
Is it safe to use CBD with Finasteride? ▾
Whether CBD is safe to combine with Finasteride depends on the metabolic pathway of Finasteride, the CBD dose and the indication for which Finasteride is taken at the 1mg dose. For many medications the interaction is mild and manageable; for narrow-therapeutic-index drugs (anticoagulants, anti-epileptics, immunosuppressants and some psychiatric medications) the combination warrants closer follow-up. Discuss with the prescriber and check an interaction database before starting CBD.
How much time should I leave between CBD and Finasteride? ▾
For most medications, separating CBD and Finasteride by several hours reduces, though does not eliminate, the metabolic interaction; for steady-state regimens with cumulative drug levels, simple time separation has limited effect. According to general pharmacological principles, the more meaningful step is establishing a stable CBD dose, monitoring symptoms and laboratory values, and adjusting Finasteride dosing under the prescriber's guidance rather than relying on timing alone.
Products containing Finasteride
More on Finasteride
- With alcoholFinasteride and alcohol — is it safe to drink?
- With foodShould Finasteride be taken with food?
- Side effectsFinasteride side effects: common, rare and warning signs
- Dosage guideFinasteride dosage guide: how much to take and when
- OnsetHow fast does Finasteride start working?
- DurationHow long does Finasteride last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.