Strep throat is treated 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. While strep throat can technically resolve on its own, antibiotics are important because they shorten the illness, reduce the chance of spreading it, and prevent serious complications.
How Strep Throat Is Diagnosed
Strep throat can’t be diagnosed by symptoms alone because it looks a lot like a viral sore throat. Your doctor will use a rapid strep test, which involves swabbing the back of your throat and produces results in minutes. If the rapid test comes back negative but strep is still suspected (especially in children), a throat culture may be sent to a lab for confirmation. Antibiotics are only prescribed after a positive test, not based on symptoms alone, because most sore throats are caused by viruses that antibiotics can’t treat.
First-Line Antibiotic Treatment
Penicillin and amoxicillin are the standard treatments for strep throat. They’ve been used for decades, and the bacteria that cause strep (group A Streptococcus) have never developed resistance to them. That makes these two drugs reliably effective for virtually everyone who can tolerate them. The typical course lasts 10 days, and it’s important to finish the entire prescription even after you feel better. Stopping early can allow surviving bacteria to bounce back and increases the risk of complications.
Amoxicillin is often preferred for children because it tastes better in liquid form and can be taken once daily, which makes it easier for parents to keep kids on schedule.
Alternatives for Penicillin Allergy
If you’re allergic to penicillin, several other antibiotics work against strep. The options your doctor chooses will depend on what type of allergic reaction you’ve had in the past.
- Cephalosporins (such as cephalexin or cefadroxil) are often used for people whose penicillin allergy caused a rash but not a severe reaction. These are closely related to penicillin, so they’re not safe for anyone who has had a serious allergic response like throat swelling or anaphylaxis. Treatment lasts 10 days.
- Azithromycin is a 5-day course, making it the shortest option. However, resistance is a growing concern. Among strep isolates tested in 2023, 27% were resistant to this class of antibiotics. Your doctor may check whether the strain circulating in your area is still susceptible before prescribing it.
- Clindamycin is another option, taken three times daily for 10 days. It faces similar resistance issues: 26% of strep isolates tested in 2023 showed resistance.
Because of those resistance rates, the CDC recommends that doctors confirm the specific strain is susceptible before relying on azithromycin or clindamycin, particularly during outbreaks.
What to Expect During Recovery
You should notice improvement within one to two days of starting antibiotics. Fever typically breaks first, followed by gradual relief of throat pain. If you’re not feeling any better after 48 hours on antibiotics, contact your doctor. That could mean the diagnosis needs a second look or the antibiotic isn’t working effectively against your particular strain.
You become non-contagious about 12 hours after your first dose. Children who feel well and have no fever can usually return to school or daycare after 24 hours of treatment. Adults can follow the same general timeline for returning to work.
Managing Pain While Antibiotics Work
Antibiotics kill the bacteria, but they don’t do much for the pain in the first day or two. Over-the-counter pain relievers like ibuprofen or acetaminophen can bring down your fever and ease throat soreness. For children, use age-appropriate formulations and dosing.
A salt water gargle is a simple, effective comfort measure. Mix about 1/4 to 1/2 teaspoon of salt into 8 ounces of warm water and gargle for 15 to 30 seconds. This temporarily reduces swelling in the throat and loosens mucus. You can repeat it several times a day. Other things that help: cold liquids or popsicles to numb the throat, warm broth, honey (for anyone over age 1), and staying well hydrated. A cool-mist humidifier can also keep your throat from drying out overnight.
Why Finishing Antibiotics Matters
Strep throat usually isn’t dangerous when treated, but untreated or undertreated infections can lead to real complications. The most concerning is rheumatic fever, an inflammatory condition that can damage the heart valves. Severe rheumatic heart disease sometimes requires surgery and can be fatal. Rheumatic fever is rare in the United States today precisely because strep is routinely treated with antibiotics.
Other possible complications of untreated strep include peritonsillar abscess (a painful collection of pus near the tonsils), kidney inflammation, and the spread of infection to the sinuses or ears. These complications are preventable with a full course of antibiotics, which is why doctors stress finishing every dose even when symptoms have already cleared up.
Recurring Strep Infections
Some people, particularly school-age children, get strep throat multiple times in a year. A single recurrence doesn’t necessarily signal a problem. It could simply mean re-exposure at school or within the household. If someone in your home keeps testing positive, everyone with symptoms should be tested and treated to break the cycle of passing the bacteria back and forth.
For people who get strep frequently (roughly seven or more episodes in a single year, or five per year over two years), a tonsillectomy may be considered. This is a last-resort option, and the decision depends on how much the recurring infections are affecting quality of life, missed school or work days, and whether antibiotics continue to resolve each episode effectively.