When taking any medicine prescribed by a dentist, it is important to finish it. Many people start taking prescription drugs, especially antibiotics, only when they feel better. The dose is precise and necessary to combat or prevent infection. By taking the medication until you feel better, all the medication has eliminated the susceptible microorganisms and leaves those often resistant. Ask your dentist before taking any over-the-counter medicines, vitamins, herbs, or dietary supplements. If you feel uncomfortable after taking your medicine, consult a dentist or pharmacist.