Cephalexin is a generic drug that’s prescribed for certain bacterial infections in adults and children. As with other drugs, cephalexin can cause side effects, such as diarrhea, nausea, or vomiting.

Doxycycline is a prescription antibiotic used to treat certain infections and acne. Common side effects include diarrhea, nausea, vomiting, and increased sensitivity to sunlight. Serious side effects ...