If you miss a dose of dutasteride, take it as soon as you remember. If it is almost time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule. Do not take two doses at once. Due to dutasteride’s long half-life of approximately 5 weeks, missing a single dose has minimal impact on overall drug levels and DHT suppression.
Why Missing a Dose Is Not Critical
Dutasteride has one of the longest half-lives of any commonly prescribed medication, approximately 5 weeks. Serum concentrations reach 65% of steady state after 1 month and about 90% after 3 months; the average steady-state concentration is 40 ng/mL after a year at 0.5 mg/day. Missing a single 0.5 mg dose causes a negligible drop in serum levels because the drug already accumulated in the body is still being slowly released.
By comparison, finasteride’s mean terminal half-life is about 5 to 6 hours in men aged 18 to 60. Daily dosing matters far more for that drug.
What to Do
- Missed by a few hours: Take it as soon as you remember.
- Missed a full day: Take your regular dose the next day. Do not double up.
- Missed several days: Resume your regular schedule. No need to take extra doses.
- Missed a week or more: Resume daily dosing. You may notice a temporary reduction in efficacy, but drug levels will rebuild over time.
Tips for Consistency
- Take dutasteride at the same time each day (e.g., with breakfast or before bed)
- Use a pill organizer or phone alarm as a reminder
- Keep your prescription refilled so you don’t run out
Full dosage guide · About the 0.5 mg dose
Sources
- MedlinePlus. Dutasteride. medlineplus.gov
- FDA. Avodart prescribing information. accessdata.fda.gov