Strep throat in kids is treated with a full course of antibiotics, typically lasting 10 days, combined with pain relief and comfort measures at home. Most children start feeling better within two to three days of starting antibiotics, but finishing the entire prescription is essential to clear the infection and prevent complications.
Getting the Right Diagnosis
A sore throat alone doesn’t mean strep. Viruses cause the majority of sore throats in children, and antibiotics won’t help those. Strep throat tends to come on suddenly with a high fever, painful swallowing, red or swollen tonsils (sometimes with white patches), and swollen lymph nodes in the neck. Cough, runny nose, and hoarseness usually point to a virus instead.
Your child’s doctor will use a rapid strep test, which involves a quick swab of the back of the throat. These tests correctly identify about 86% of true strep cases and rule it out correctly about 95% of the time. Because the rapid test misses roughly 14 out of 100 positive cases, many pediatric offices send a backup throat culture when the rapid test comes back negative. That culture takes one to two days but is more accurate. If your child’s symptoms strongly suggest strep and the rapid test is negative, ask whether a culture was sent.
Antibiotics: What to Expect
Amoxicillin is the standard first-line treatment. It’s effective, well-tolerated, and comes in a liquid form that most kids accept. The typical course is 10 days. Your child’s dose is based on their weight, so don’t adjust it on your own or use leftover medication from a sibling.
The 10-day course matters even though your child will likely feel much better by day two or three. Stopping early allows surviving bacteria to rebound, which can lead to a second round of illness or, more seriously, complications like rheumatic fever. Set a phone reminder if it helps you stay on track through those last few days when your child seems perfectly fine.
If Your Child Has a Penicillin Allergy
For kids with a mild penicillin allergy (a rash, for example, but no breathing problems or swelling), a first-generation cephalosporin like cephalexin is a common alternative, also given for 10 days. Children with a severe allergy, the kind that causes throat swelling or difficulty breathing, need a different class of antibiotic entirely. Azithromycin (a five-day course) or clindamycin (a 10-day course) are the typical options in that case. Make sure your child’s doctor knows the specific type of allergic reaction your child has had.
Managing Pain and Fever at Home
Strep throat hurts, and your child doesn’t need to tough it out while waiting for antibiotics to kick in. Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) both work well for throat pain and fever. Ibuprofen also reduces inflammation, which can make swallowing more comfortable.
A few rules to keep in mind:
- Acetaminophen can be given to infants two months and older. No more than five doses in 24 hours. Dose by your child’s weight, not age, using the chart on the package.
- Ibuprofen is safe for babies six months and older. No more than four doses in 24 hours. Don’t use it if your child is dehydrated or vomiting repeatedly.
Both medications come in infant drops, children’s liquid, and chewable tablets for older kids. Always use the measuring syringe that comes with the product rather than a kitchen spoon, which can easily deliver the wrong amount.
Comfort Measures That Actually Help
Cold or warm liquids, whichever your child prefers, can soothe throat pain. Popsicles, smoothies, and warm broth are good options, especially if your child is resistant to drinking enough fluids. Staying hydrated helps the body fight infection and keeps the throat from drying out.
For children six and older, gargling with warm salt water several times a day can reduce swelling and ease pain. Mix half a teaspoon of salt into one cup of warm water. Most kids younger than six can’t gargle reliably, so skip this for toddlers and preschoolers.
Honey is another effective soother for sore throats and coughs. About one and a half teaspoons before bedtime has been shown to reduce cough severity and improve sleep as well as some over-the-counter cough syrups. It’s safe for children one year and older. Never give honey to a baby under 12 months because of the risk of botulism. The American Academy of Pediatrics advises against OTC cough and cold medications for children under six, making honey a particularly useful alternative for that age group.
Soft foods like yogurt, applesauce, mashed potatoes, and scrambled eggs are easier to swallow than anything crunchy or acidic. If your child doesn’t want to eat much for a day or two, that’s okay as long as they’re drinking fluids.
When Your Child Can Go Back to School
Children with strep are contagious until they’ve been on antibiotics for at least 12 hours. Most schools and daycares follow this rule: your child needs to have taken antibiotics for a full 12 hours and have no fever before returning. If your child starts antibiotics in the evening, the next morning is usually too soon. Plan on keeping them home through the following day.
Strep spreads through respiratory droplets (coughing, sneezing, sharing cups or utensils). While your child is home, have them use their own drinking glass and wash their hands frequently. Replace their toothbrush once they’ve been on antibiotics for a couple of days.
Why Finishing Treatment Matters
Untreated or undertreated strep throat can lead to rheumatic fever, a serious inflammatory condition that can damage the heart valves. Rheumatic fever typically develops one to five weeks after a strep infection. It’s uncommon in the United States today precisely because most strep cases are treated with antibiotics, but it still happens when infections go undiagnosed or prescriptions aren’t completed.
Another possible complication is post-streptococcal kidney inflammation, which can cause dark or cola-colored urine, swelling in the face or ankles, and reduced urine output. This typically appears one to three weeks after the infection. Unlike rheumatic fever, kidney inflammation can occasionally develop even with proper antibiotic treatment, but it usually resolves on its own.
A peritonsillar abscess, a pocket of pus that forms near the tonsil, is a less common but more immediately noticeable complication. Signs include severe one-sided throat pain, difficulty opening the mouth, a muffled voice, and drooling. If your child has trouble breathing or swallowing, or develops any of these symptoms, they need prompt medical evaluation.
Recurring Strep Infections
Some kids seem to catch strep repeatedly. If your child has had multiple confirmed infections within a single year, their doctor may discuss whether a tonsillectomy makes sense. This isn’t a first-line approach, but for children who are missing significant school time or dealing with frequent courses of antibiotics, it can reduce the frequency of infections going forward. The threshold most specialists use is seven or more confirmed strep infections in one year, five per year for two years, or three per year for three years.
It’s also worth noting that some children test positive for strep but aren’t actually sick. They’re strep carriers, meaning the bacteria live in their throat without causing symptoms. When carriers get a viral sore throat and happen to be tested, the result comes back positive even though the virus is the real culprit. If your child tests positive repeatedly but doesn’t have classic strep symptoms, your doctor may explore this possibility.