 <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]  Skipping doses or stopping the medication too early may allow bacteria to continue to grow, which may result in a return of the infection and make the bacteria more difficult to treat (resistant). Do not take more of this drug than directed because it may increase your chance of side effects. Tell your doctor if symptoms of a urinary tract infection return (such as burning/painful/frequent urination).The side effects of Uroqid-Acid No.2 Oral: Nausea, vomiting, diarrhea, abdominal cramps, and loss of appetite may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Painful or difficult urination may occur with this medication, although less often. Report these side effects to your doctor, who may need to lower your dose of this medication or change your treatment to make your urine less acidic. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Taking higher than recommended doses of methenamine may cause bladder irritation, painful/frequent urination, and bloody/pink urine. Tell your doctor right away if you have any of these </s>