Famodar Is A Brand Name For Famotidine, A Medication Commonly Used For The Treatment Of Conditions Related To Excessive Stomach Acid Production. Famotidine Belongs To The H2-Receptor Antagonist Class Of Drugs, Which Reduce Acid Production In The Stomach. Side Effects: Common: Headache, Dizziness, Constipation, Or Diarrhea. Rare: Allergic Reactions, Confusion (In Elderly Patients), Or Liver Enzyme Abnormalities. Precautions: Consult A Doctor Before Use If Pregnant, Breastfeeding, Or Taking Other Medications. Not Recommended For Patients With Severe Kidney Impairment Without Dose Adjustments. Avoid Prolonged Use Without Medical Advice To Prevent Masking More Serious Conditions.