Strep throat is cured with antibiotics, typically a 10-day course of penicillin or amoxicillin. Most people start feeling better within one to two days of their first dose, but finishing the full course is essential to clear the infection completely and prevent serious complications.
How Strep Throat Is Diagnosed
Before treatment can start, you need a confirmed diagnosis. Strep throat shares symptoms with viral sore throats, and antibiotics won’t help a virus. Doctors evaluate four signs to estimate the likelihood of a bacterial infection: fever at or above 100.4°F (38°C), swollen lymph nodes at the front of the neck, white patches or swelling on the tonsils, and the absence of a cough. The more of these you have, the more likely strep is the cause.
A rapid strep test can confirm the diagnosis in minutes, but it catches only about 70% of true cases. Its strength is specificity: if the test says positive, it’s almost certainly correct (98% accuracy). A negative rapid test, though, doesn’t rule strep out. Many clinics follow up a negative rapid test with a throat culture, which is more sensitive at around 81%. Combining both approaches catches roughly 85% of infections. If your rapid test comes back negative but your symptoms strongly suggest strep, ask whether a culture is being sent.
The Standard Antibiotic Treatment
Amoxicillin and penicillin are the first-choice antibiotics for strep. They’ve been the standard for decades, and the bacterium that causes strep throat (Group A Streptococcus) has never developed meaningful resistance to them. Adults typically take penicillin twice daily for 10 days. Amoxicillin is often preferred for children because it tastes better in liquid form and can be dosed once or twice a day.
If you’re allergic to penicillin, your doctor has several alternatives. For mild allergies (a rash, not a breathing emergency), a related antibiotic called cephalexin is often used for 10 days. For severe penicillin allergies, options include azithromycin (a five-day course) or clindamycin (10 days). It’s worth noting that resistance to these backup antibiotics is climbing. A large global analysis found that about 34% of Group A Strep samples now resist azithromycin, and nearly 10% resist clindamycin. Penicillin-based treatments remain reliably effective, which is one reason they stay the default choice.
What Recovery Looks Like
You should notice improvement within one to two days of starting antibiotics. Fever usually breaks first, followed by a gradual reduction in throat pain. Even though you’ll feel significantly better early on, the full 10-day course (or 5 days for azithromycin) is non-negotiable. Stopping early can leave surviving bacteria in your throat, increasing the chance of a relapse and contributing to antibiotic resistance.
While antibiotics do the heavy lifting, over-the-counter pain relievers like ibuprofen or acetaminophen help manage throat pain and fever in the meantime. Avoid giving aspirin to children or teenagers, as it’s been linked to Reye’s syndrome, a rare but dangerous condition. Cool fluids, warm broth, and soft foods can also ease discomfort during the first couple of days.
Why You Shouldn’t Skip Treatment
Strep throat can technically resolve on its own, but leaving it untreated carries real risks. The most serious is rheumatic fever, which can develop one to five weeks after an untreated strep infection. Rheumatic fever triggers inflammation throughout the body and can permanently damage heart valves. Severe cases require surgery and can be fatal. It’s rare in countries where antibiotics are widely available, but only because most people get treated.
Untreated strep can also lead to a kidney condition called post-streptococcal glomerulonephritis, where the immune response to the infection damages the kidneys’ filtering system. Peritonsillar abscess, a painful pocket of pus near the tonsils, is another possible complication. These aren’t common outcomes, but they’re entirely preventable with a simple course of antibiotics.
Preventing Spread and Reinfection
Strep is highly contagious through respiratory droplets. You’re generally considered non-contagious after 12 to 24 hours on antibiotics, but during that initial window, avoid sharing cups, utensils, or close face-to-face contact. Handwashing is the single most effective prevention measure.
You may have heard that you should replace your toothbrush after strep to avoid reinfecting yourself. A study that specifically tested this found no difference in recurrence rates between people who changed their toothbrush and bedding and those who didn’t. The bacteria on your toothbrush don’t appear to cause reinfection once antibiotics have done their job. If recurrent strep is a problem, the issue is more likely re-exposure from a close contact who’s carrying the bacteria without symptoms.
When Strep Keeps Coming Back
Some people, particularly school-age children, deal with multiple strep infections per year. Recurrent strep has a few possible explanations: ongoing exposure to a carrier (a family member or classmate who harbors the bacteria without getting sick), incomplete antibiotic courses, or simply bad luck with repeated exposures. Your doctor may try a different antibiotic for recurrent episodes or test household members to identify a carrier. Tonsil removal is sometimes considered for children who experience multiple confirmed infections per year over several years, though it’s generally a last resort after other strategies have been tried.