Keep in mind that doxycycline products are available in multiple forms, including doxycycline hyclate and doxycycline monohydrate. Doxycycline hyclate is more likely to cause GI upset or ulcers.

You'll need a prescription from your healthcare provider to take doxycycline. Doses vary from as low as 40 milligrams (mg) once daily to 100 mg twice daily. Using doxycycline alongside these ...