 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  (such as amitriptyline), theophylline, among others. Since cimetidine reduces the amount of acid in your stomach, it may also change the absorption of certain medications and affect how they work. Some examples of affected drugs include atazanavir, dasatinib, certain azole antifungals (such as itraconazole, ketoconazole), levoketoconazole, pazopanib, sparsentan, among others. Ask your doctor or pharmacist if any of the medications you take are affected by cimetidine and how to manage this interaction. Cigarette smoking can affect this medication. Tell your doctor if you smoke and if you stop or start smoking while using this medication. This medication and similar H2 blockers (such as famotidine, nizatidine, ranitidine) are available both with and without a prescription. Do not take them at the same time. Does Cimetidine interact with other drugs you are taking? Enter your medication into the WebMD interaction checker Check InteractionThe overdose of Cimetidine Oral: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison </s>