The absorption of the medication is not affected by whether you take Darvon before or after a meal. Darvon can treat irregular or functional uterine bleeding, premenstrual tension syndrome, endometriosis, and pre-eclampsia, etc. The timing of the medication varies for different conditions and the dosage varies. If treating dysmenorrhea take it twice a day and start taking it from the fifth day of menstruation until the twenty-fifth day of menstruation. If treating endometriosis, it can be taken three times a day, also starting on the fifth day of menstruation. If treating functional uterine bleeding or for hemostatic treatment, the dosage of Darvon is twice a day and it is recommended to take it for five to seven consecutive days. Therefore, the timing and dosage of the medication varies from disease to disease and must be taken as prescribed by the doctor.