Progesterone
Prescription status is set country by country — the label where you live is the one that applies.
Beta: the medication section is still being tested, and its data may contain errors. Do not rely on it for a decision about your own treatment.
Progesterone is identical to the hormone the ovary produces after ovulation, and it acts on progesterone receptors to oppose the effect of estrogen on the uterine lining. In menopausal therapy it is given alongside estrogen to protect that lining, and it is also used in cycle-related indications.
A usual adult range, not a national label — the dose and the timing differ by country and by product.
Approved uses differ by country — some of these may be off-label or unapproved where you live.
It is taken at bedtime, and that timing is deliberate rather than arbitrary: progesterone is metabolised into compounds that act on the brain much as a sedative does, so it reliably causes drowsiness, and taking it at night turns that into an advantage. Dizziness and a hungover, slowed feeling the next morning are possible, so driving or operating machinery deserves caution until the effect is known. Alcohol and other sedating medicines will add to it.
Drowsiness that persists well into the day, severe dizziness, or unexpected vaginal bleeding are reasons to see a doctor rather than adjust things independently.
Reference information, not medical advice. Discuss any change with your doctor.