Strep throat requires antibiotics. Unlike a regular sore throat caused by a virus, strep is a bacterial infection that won’t resolve on its own and can lead to serious complications if left untreated. The standard treatment is a 10-day course of penicillin or amoxicillin, and most people start feeling better within a day or two of starting medication.
Getting the Right Diagnosis First
Not every sore throat is strep. Doctors use a set of four clinical signs to decide whether testing is warranted: fever of 100.4°F (38°C) or higher, no cough, swollen lymph nodes at the front of the neck, and white patches or swelling on the tonsils. Each sign counts as one point on a scoring system that ranges from 0 to 4. A score below 3 generally makes strep unlikely, while a score of 3 or 4 calls for a rapid antigen test or throat culture to confirm the diagnosis.
This matters because antibiotics won’t help a viral sore throat, and taking them unnecessarily contributes to resistance. A rapid strep test takes about 10 to 15 minutes. If it comes back positive, you need antibiotics regardless of your age.
Antibiotics: What You’ll Take and for How Long
Penicillin and amoxicillin are the first-choice antibiotics for strep. They’re inexpensive, effective, and well-tolerated. The typical course lasts 10 days. Adults usually take penicillin V 500 mg twice daily, while children take a lower dose two or three times daily. Amoxicillin is often preferred for kids because it tastes better in liquid form and can be given once a day.
For people with a penicillin allergy, doctors will choose an alternative antibiotic. The specific option depends on the type of allergy you have. If your reaction was mild (like a rash), a first-generation cephalosporin is often safe. If your allergy is more serious, other classes of antibiotics are available.
One important note on resistance: group A strep bacteria remain universally sensitive to penicillin, which is why it’s still the go-to treatment decades later. However, resistance to other antibiotics like azithromycin (commonly known as a Z-pack) and clindamycin has climbed dramatically. Studies have found resistance rates to these drugs exceeding 70% in some populations. This is a strong reason to stick with penicillin or amoxicillin when possible, rather than requesting a Z-pack.
Finishing the Full Course
You’ll likely feel significantly better within 48 hours of starting antibiotics. That improvement tempts a lot of people to stop taking the medication early. Don’t. The full 10-day course is necessary to completely eliminate the bacteria and prevent complications. Stopping early increases the risk of the infection returning and contributes to antibiotic resistance.
If swallowing pills is too painful in the first day or two, talk to your doctor. A single injection of penicillin is an alternative that eliminates the need to take oral medication for 10 days.
Managing Pain and Discomfort at Home
Antibiotics kill the bacteria, but they don’t do much for the immediate pain. Over-the-counter pain relievers like ibuprofen (Advil, Motrin) or acetaminophen (Tylenol) are the best options for reducing both throat pain and fever. Ibuprofen has the added benefit of reducing inflammation, which can help with swelling.
Other things that help while you recover:
- Salt water gargling. Mix 1/4 teaspoon of table salt in 8 ounces of warm water and gargle several times a day. This is effective for older children and adults but isn’t practical for young kids.
- Soft foods and cold liquids. Warm broth, smoothies, and popsicles are easier on a raw throat than anything crunchy or acidic.
- Rest and fluids. Your body is fighting an infection. Staying hydrated and sleeping more than usual helps recovery.
Avoid giving aspirin to children or teenagers with strep, as it’s linked to a rare but serious condition called Reye’s syndrome.
When You Can Go Back to Work or School
Current public health guidelines recommend staying home for at least 24 hours after starting antibiotics. The science supports this: a large meta-analysis found that after 24 hours of oral antibiotics, only about 7% of people still tested positive for the bacteria on a throat culture. By days 3 through 9, that number dropped below 3%. You should also wait until your fever has resolved before returning to normal activities.
Strep is highly contagious before treatment and in those first hours after starting antibiotics. It spreads through respiratory droplets, so sharing cups, utensils, or close face-to-face contact can pass it along. Washing your hands frequently during this window is one of the simplest ways to protect the people around you.
Replace Your Toothbrush After Recovery
Strep bacteria can survive on your toothbrush even after you’ve recovered. The Cleveland Clinic recommends replacing your toothbrush after illnesses like strep throat to avoid reintroducing bacteria into your mouth. It’s a small step, but it’s worth doing, especially if you’ve dealt with recurring infections.
What Happens If Strep Goes Untreated
The most concerning complication of untreated strep is rheumatic fever, an inflammatory condition that can damage the heart valves. Rheumatic heart disease, if severe, can require surgery and can be fatal. This complication is most common in school-age children between 5 and 15, though it’s rare in children under 3 and in adults.
Another potential complication is post-streptococcal kidney inflammation, which can cause blood in the urine, swelling, and high blood pressure. Untreated strep can also spread locally, leading to abscesses around the tonsils or infections in the sinuses and ears.
These complications are largely preventable with prompt antibiotic treatment. That’s the core reason strep requires medical attention rather than a wait-and-see approach. Even if your symptoms feel manageable, the bacteria need to be treated to protect against downstream damage that may not show up for weeks.
Dealing With Recurring Strep Infections
Some people, especially children, seem to get strep throat multiple times a year. There are a few possible explanations. You may be getting reinfected by a close contact who’s carrying the bacteria without symptoms (a “strep carrier”). You might also be reinfecting yourself through a contaminated toothbrush or not fully clearing the bacteria from a previous round.
If strep keeps coming back, your doctor may try a different antibiotic or test family members and close contacts. In cases where a child has seven or more documented strep infections in a single year, or five per year for two consecutive years, tonsillectomy becomes a reasonable conversation. For most people, though, recurring strep eventually becomes less frequent as the immune system matures and builds broader defenses against the bacteria.