How long does strep throat last after biocillin shot?

Strep throat is a bacterial infection of the throat and tonsils. It is usually caused by the Streptococcus pyogenes bacterium, also known as group A Streptococcus (GAS). Biocillin is a brand name for the antibiotic penicillin. It is used to treat a variety of bacterial infections, including strep throat. Penicillin is effective at killing the bacteria that cause strep throat. Symptoms of strep throat usually start to improve within 24-48 hours of starting penicillin treatment. However, it is important to take the full course of antibiotics as prescribed by your doctor to ensure that the infection is completely cured.