The most common side effects of antibiotics that affect the digestive system are approximately 10%. These side effects include: vomiting, nausea, diarrhea, bloating and indigestion, abdominal pain, and loss of appetite. The symptoms of these side effects are usually mild and can be relieved once the antibiotic is stopped. If you have any other side effects or serious symptoms, please contact your doctor for advice. Allergic reactions Allergic reactions are more common with penicillin and cephalosporins and have a probability of occurring in about 7% of cases, depending on the individual’s body type. Most allergic reactions are mild to moderate and manifest as follows: rash, itching (urticaria), cough, wheezing, tightness in the throat, which may lead to difficulty in breathing. In rare cases, antibiotics can cause severe and possibly life-threatening allergic reactions with the same initial symptoms as mild allergic reactions: feeling dizzy or lightheaded, difficulty breathing, wheezing, rapid heartbeat, palpitations, profuse sweating, nervousness and anxiety, confusion, and possibly other allergic symptoms such as itching, hives, swelling, or stomach pain that require prompt medical attention. Tetracycline sensitivity to light Tetracycline can make your skin sensitive to sunlight or artificial light. Avoid prolonged exposure to bright light when taking these medications. Serious complications of fluoroquinolones In rare cases, fluoroquinolone antibiotics can cause disabling, permanent side effects that affect the joints, muscles, and nervous system. Stop the medicine immediately and consult your doctor if serious side effects occur, including: tendon, muscle, or joint pain-usually in the knee, elbow, or shoulder, a tingling, numbness, or pins and needles sensation