Chlorothiazide is a medication primarily used to treat high blood pressure and fluid retention (edema). It belongs to a class of drugs known as thiazide diuretics, which help the body eliminate excess salt and water through urine. This action can lower blood pressure and reduce swelling in conditions like heart failure or kidney disorders. Patients taking Chlorothiazide may experience side effects such as increased urination, dizziness, or electrolyte imbalances. It is important to monitor blood pressure and kidney function regularly while on this medication. Always consult a healthcare provider for personalized advice and dosage adjustments.