In general, doxycycline and clindamycin phosphate are not used together. This is because they can compete with each other for absorption in the gut, which can reduce the effectiveness of both antibiotics. Additionally, doxycycline can increase the risk of side effects from clindamycin phosphate, such as diarrhea and pseudomembranous colitis.
However, there are some cases in which doxycycline and clindamycin phosphate may be used together. For example, they may be used together to treat severe acne vulgaris. In these cases, the antibiotics are typically used for a short period of time, and the doses are carefully monitored.
If you are considering taking doxycycline and clindamycin phosphate together, it is important to talk to your doctor first. Your doctor can assess your individual situation and determine whether this combination of antibiotics is right for you.