Short answer: The minoxidil tablet Patient Information says that if you forget a dose, wait until it is time for your next dose, then continue with your regular schedule. The same label says not to skip doses or stop without checking with your doctor. It is a high blood pressure label; it states hair growth is not an approved use.
| Situation | What the label says |
|---|---|
| Schedule | Once a day, or split into two doses, as prescribed (Dosage and Administration) |
| Forgot a dose | Wait until the next dose, then continue the regular schedule (Patient Information) |
| Stopping | Do not stop without checking with your doctor (Patient Information) |
| Approved use | High blood pressure only; hair growth is not approved (Precautions, Unapproved Use) |
| Duration of effect | About 75 hours after a single dose (Clinical Pharmacology) |
This is an older-format label without numbered sections. Its Patient Information says: take all your medicine according to the schedule prescribed by your doctor. Do not skip any doses. If you should forget a dose of minoxidil, wait until it is time for your next dose, then continue with your regular schedule.
It also says: do not stop taking minoxidil, or any of your other high blood pressure medicines, without checking with your doctor.
The label covers high blood pressure only. Under Precautions, Unapproved Use, it says the use of minoxidil tablets in any formulation to promote hair growth is not an approved indication. So no FDA label gives a missed-dose rule for hair-loss dosing; that plan comes from the prescriber.
Clinical Pharmacology: after an effective single dose, blood pressure usually starts to fall within half an hour, reaches its low point at 2 to 3 hours, and the total duration of effect is about 75 hours. The average plasma half-life is 4.2 hours; the effect lasts much longer than the drug stays in the blood.
The label says minoxidil is usually given with a water pill (diuretic) and a medicine to slow the heart rate, and that all of them should be taken in the right amounts each day. Its Warning Signals list includes a resting pulse rise of 20 beats a minute or more and a fast weight gain of more than 5 pounds.
This page summarizes FDA labeling. It is not personalized medical advice; confirm what to do with your prescriber or pharmacist.