Medicine Name: Riborea Capsule. Composition: Hydroxyurea (500mg). Side Effects: Hematological disorder Gastrointestinal disorder Eating disorder Azoospermia absence of sperms Decreased appetite Fever Oligospermia low sperm count Skin cancer Bone marrow suppression Hallucination Convulsion Peripheral neuropathy tingling and numbness of feet and hand Pulmonary fibrosis Pulmonary edema Pancreatic inflammation Liver toxicity Cutaneous vasculitis Increased uric acid level in blood.