Antibiotic doryx
How long does it take once you quit Doryx for it to leave your system? - Acne.org Message Boards It s half-life is 12 to 24 hours, so somewhere between 12 and 24 hours after taking it, you ll have half of whatever your dose was left in you. (Example: You take 100 mg; you ll have 50 left.) After another 12 to 24 hours, so between 24 and 48 hours after you took the pill, you ll have 25 mg left. Between 36 and 72 after you took the pill, you ll only have 12.5 mg left in your body. So . . . it s pretty variable.During those 3 weeks, you d want to use a condom to reduce your chance of pregnancy. Depending on how close you and your partner are, if your main concern is avoiding pregnancy, and you AREN T concerned about catching STIs/STDs, using a spermicide (film, foam . . . ) along with the condom will lower your chances of pregnancy down to the level (under 1%) they are on the pill. If you don t know your partner as well, and STIs ARE a concern, spermicide might be a bad idea, because it slightly degrades the condom on a microscopic level, so things smaller than sperm (ie viruses) may be able to get through. Then, sticking with the plain condom would be your best bet.