Strep throat is treated with antibiotics, and the go-to choices are penicillin and amoxicillin. These have been the standard first-line treatment for decades because the bacteria that cause strep (group A Streptococcus) have never developed resistance to them. Most people take a 10-day course of oral antibiotics, though a single injection is also an option.
First-Line Antibiotics
Penicillin and amoxicillin are the two antibiotics prescribed most often for strep throat. They’re equally effective, but amoxicillin is more commonly given to children because it comes in a chewable tablet and a flavored liquid suspension that’s easier for kids to tolerate. Adults typically receive penicillin or amoxicillin in pill form, taken two or three times daily for 10 days.
For people who have trouble finishing a 10-day pill regimen, or for young children where consistent dosing is a concern, there’s a one-shot alternative. A single injection of long-acting penicillin (given in the muscle at a clinic) treats the infection without requiring any pills at home. This is sometimes the preferred route when there’s doubt about whether a patient will complete the full oral course.
Options If You’re Allergic to Penicillin
If you have a penicillin allergy, your doctor has several alternatives. Which one you get depends on the type of allergic reaction you’ve had in the past.
- Cephalexin or cefadroxil: These are in the same broad family as penicillin but are safe for people whose allergy caused a rash or mild symptoms. They’re taken for 10 days. However, if your reaction to penicillin was severe (throat swelling, difficulty breathing, hives that came on fast), these should be avoided.
- Azithromycin: A 5-day course, which is shorter than other options. It’s a convenient choice, but some strep strains have developed resistance to it, so it’s not the first pick unless penicillin-type drugs are off the table.
- Clindamycin: Taken three times daily for 10 days. This is an option for people with severe penicillin allergies who can’t take the alternatives above.
- Clarithromycin: Taken twice daily for 10 days, another option for penicillin-allergic patients.
Why the Full Course Matters
Most people start feeling better within two to three days of their first antibiotic dose. That improvement can be tempting to interpret as a sign the infection is gone, but the bacteria can still be alive in your throat. Stopping early gives them a chance to rebound and increases the risk of complications.
The most serious complication of untreated or undertreated strep is rheumatic fever, which can develop one to five weeks after the initial infection. Rheumatic fever causes inflammation throughout the body and can permanently damage heart valves. Severe cases require heart surgery and can be fatal. A kidney condition called post-streptococcal glomerulonephritis is another possible complication, though less common. Finishing your full antibiotic course is the single most important thing you can do to prevent these outcomes.
How Quickly Antibiotics Work
Antibiotics start working fast. Within 12 hours of your first dose, you’re generally no longer contagious. That’s the threshold schools and daycares use to decide when a child can return. Pain and fever usually improve noticeably within 24 to 48 hours, though it can take a few days to feel fully back to normal.
If you’ve been on antibiotics for 48 hours and aren’t feeling any better at all, contact your doctor. It could mean the diagnosis needs a second look or that a different antibiotic is needed.
Managing Pain While Antibiotics Kick In
Antibiotics kill the bacteria, but they don’t directly relieve pain. Over-the-counter pain relievers are the best tool for the first couple of days when your throat still feels raw. Ibuprofen (Advil, Motrin) and acetaminophen (Tylenol) both reduce throat pain and bring down fever. You can alternate between the two if one alone isn’t enough. One important caution: don’t give aspirin to children or teenagers, as it’s linked to Reye’s syndrome, a rare but serious condition.
Home Remedies That Help With Comfort
While no home remedy replaces antibiotics for strep, several can make the waiting period more bearable. A saltwater gargle, made with one cup of warm water, an eighth of a teaspoon of salt, and a quarter teaspoon of baking soda, can soothe irritation and help cleanse the throat. Gargle and spit three to four times a day.
Honey is a natural anti-inflammatory and coats the throat well. Add it to warm chamomile tea for a combination that many people find genuinely soothing. (Honey is safe for anyone over one year old.) Cold foods work too. Popsicles and ice cream numb the throat temporarily and can be especially helpful for kids who are refusing to eat or drink because of pain. Staying hydrated matters more than eating during the worst of it, so whatever gets fluids in is worth trying.
Children and Strep Throat Treatment
Children get the same antibiotics as adults, just at doses calculated by their body weight. Amoxicillin is the most common choice for kids because of its taste and availability in liquid form. Your pediatrician will determine the right dose based on your child’s weight, so there’s no need to calculate it yourself.
For children who resist taking medicine or who tend to spit it out, the single penicillin injection can be a practical alternative. It’s one visit, one shot, and the treatment is complete. The injection is given in the muscle and can be uncomfortable, but for some families it’s far easier than wrestling with 10 days of oral medication. Children under 60 pounds receive a lower dose than older kids.
Keep your child home from school or daycare until they’ve been on antibiotics for at least 12 hours. After that, if they feel well enough, they can go back.