The causes of hoarseness in the throat are bacterial infection, viral infection, congestion and swelling of the throat. You should buy medicines for hoarseness in the throat such as antibiotics, antivirals, antipyretics, analgesics, glucocorticosteroids, and oral gargles. 1. Bacterial infections: can be treated with antibiotics, such as penicillin. 2. Viral infections: antiviral drugs are needed to treat them, such as acyclovir. 3. Throat congestion and swelling: can be treated with glucocorticoids, such as dexamethasone. If the hoarseness is accompanied by pain, you can use antipyretic and analgesic drugs, such as ibuprofen, etc.; there are also oral gargles and other drugs to clean and sterilize the mouth. The above medications should be taken under the guidance of a doctor and should not be used without authorization.