It is often recommended to take probiotics for vaginal and intestinal health. Some individuals may experience increased discharge or a burning sensation when taking probiotics. Regarding the use of doxycycline for acne, a typical treatment can last 3 to 6 weeks, but you can stop when you feel satisfied with your skin. As for probiotics, there is varying evidence on their effectiveness, so it may not be necessary to take them. If you have any further questions, feel free to ask for additional information.