Slim-Fit Capsule containing sibutramine is not commonly known to cause frequent urination or an increased urge to urinate as a typical side effect. Individual responses can vary depending on lifestyle, other medications, and underlying health conditions, and these symptoms may be more likely related to factors such as excess caffeine intake, diabetes, urinary tract infection, or bladder-related problems rather than the medicine itself. Because sibutramine carries important safety concerns, it should only be used under strict medical supervision. If the symptoms persist or are accompanied by excessive thirst, burning urination, weakness, or unexplained weight loss, consult your doctor for proper evaluation.