How long does it take amoxicillin to work?

According to AboutKidsHealth, amoxicillin begins to work within a few days after beginning the dosage. This medicine is like penicillin and works to fight bacteria, WebMD explains.

WebMD states that amoxicillin doesn't work on viral infections, such as the common cold. Patients need to take the medication with or without food every eight to 12 hours as directed by the physician. The treatment plan is based on the medical condition and how well the patient responds is to treatment.

According to WebMD, adding the measured amount to formula, juice, water or milk is appropriate. The entire mixture must be consumed immediately. The site warns against pre-mixing for future usage.