Nausea, diarrhea, headache, or dizziness may occur at first as your body adjusts to the medication. If these effects persist or become bothersome, inform your doctor. Notify your doctor if you experience unusual bleeding or bruising, pounding chest pain, rash, difficulty sleeping, mental changes, or extreme weakness while taking this medication. If you have kidney or liver disease, tell your doctor before taking this drug. If you have ulcers, do not smoke cigarettes.
Smoking apparently inhibits ulcer healing.
Women who are pregnant or breast-feeding should inform their doctors before taking this medication. Drug Interactions Tell your doctor what prescription and nonprescription medications you are taking, including ketoconazole. Your doctor may recommend some lifestyle changes such as stress-reducing programs, diet changes and exercise to assist in the treatment and prevention of ulcers. Ranitidine may affect the results of tests for urine protein. Be sure to tell your doctor you are taking ranitidine.