Medicine Name: Vanlid 250mg Capsule. Composition: Vancomycin (250mg). Side Effects: Breathlessness Vomiting Nausea Decreased potassium level in blood Abdominal pain Decreased white blood cell count neutrophils Phlebitis Hypotension low blood pressure Flatulence Hearing loss Renal toxicity Headache Fever Peripheral edema Fatigue Urinary tract infection Back pain Red man syndrome.