We usually take medicine, drinking the right water is vital. Which drugs need to drink a lot of water: (1) theophylline drugs have a diuretic effect, so that the increase in urine volume is prone to dehydration, dry mouth. (2) phenylpropanol, dehydrocholic acid, ursodeoxycholic acid easily cause excessive bile secretion and diarrhea, water loss. (3) Ritonavir and nelfinavir may cause urinary tract stones or kidney stones. (3) Ritonavir and nelfinavir may cause urinary tract stones or kidney stones, so you should drink more water to prevent stone formation; (4) Arlen phosphate and paclitaxel sodium phosphate are irritating to the esophagus, and may cause water and electrolyte disorders. Therefore, drink more water to reduce esophageal irritation and correct water and electrolyte disorders; (5) taking benzbromarone, propofol, allopurinol and Chinese medicine with stone removal, drink more water to dilute urine to prevent uric acid deposition to form stones and reduce urine salt precipitation; (6) sulfonamides are easy to form crystalline precipitation, drink more water and alkalinize urine to avoid; (7) aminoglycoside antibiotics, fluoroquinolones, drinking water will speed up excretion and reduce nephrotoxicity. Which drugs need to limit drinking water: taking these drugs should not drink water or drink as little water as possible. Drugs for stomach problems such as bitter stomachic, gastric mucosa protectors (aluminum thioglycollate, bismuth gum), chewable tablets, cough suppressants, anti-diuretics (desmopressin), sublingual tablets (nitroglycerin), etc. Which drugs should not be taken with hot water: Some drugs are easily degraded and invalidated or live bacteria inactivated by heat, such as digestive aids, vitamins, live vaccines, active bacteria (Lactase, Bifidobacterium lactis triptans tablets, etc.). Please drink the right water to take drugs, will alleviate some unnecessary pain, to avoid adverse reactions, and sometimes play a half-hearted effect.