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How long does it take for clindamycin to work on strep?

3 min read

Most people with strep throat typically feel better within 24 to 48 hours of starting antibiotic treatment. When prescribed as an alternative to first-line antibiotics, understanding the timeline for how long it takes for clindamycin to work on strep is essential for proper recovery and complication prevention.

Quick Summary

Clindamycin for strep throat typically starts showing symptom improvement within one to two days, with the fever usually subsiding first. Completing the full course, generally 10 days, is crucial to fully eradicate the infection, prevent complications, and avoid resistance.

Key Points

  • Timeline for Relief: Symptoms of strep throat, such as fever and sore throat, typically begin to improve within 24 to 48 hours of starting clindamycin.

  • Complete the Full Course: It is essential to finish the entire 10-day prescription of clindamycin, even if symptoms disappear early, to prevent serious complications like rheumatic fever and recurrence.

  • Alternative to Penicillin: Clindamycin is not a first-choice treatment for strep, but a crucial alternative for patients who have a penicillin allergy.

  • Inhibits Toxin Production: Unlike some antibiotics, clindamycin works by inhibiting protein synthesis and bacterial toxins, which can be beneficial in severe infections like toxic shock syndrome.

  • Recognize Treatment Failure: If there is no improvement after 48 hours, contact a healthcare provider. This could indicate resistance to clindamycin, a misdiagnosis (viral infection), or an intracellular bacterial infection.

  • Risk of C. difficile: Clindamycin carries a higher risk of causing Clostridioides difficile-associated diarrhea compared to some other antibiotics.

In This Article

Understanding How Clindamycin Fights Strep

Clindamycin is an antibiotic used to treat Streptococcus pyogenes, the bacteria causing strep throat, often when patients are allergic to standard treatments like penicillin or amoxicillin. Unlike penicillin, which affects the bacterial cell wall, clindamycin inhibits bacterial protein synthesis by binding to the 50S ribosomal subunit. This action not only limits bacterial growth but also inhibits the production of toxins that contribute to severe symptoms.

The Typical Timeline for Symptom Relief

Following a strep diagnosis, patients on clindamycin generally notice symptom improvement within one to three days. Fever often decreases significantly within 24 hours, and sore throat and other symptoms usually start to ease within 48 hours. While most individuals feel much better or recovered within 3-5 days, completing the full antibiotic course is crucial to fully clear the infection and avoid complications. If symptoms do not improve after 48 hours, medical advice should be sought.

Clindamycin vs. Other Strep Antibiotics

Clindamycin is a vital alternative to penicillin and amoxicillin for strep throat, especially for those with allergies. The choice of antibiotic depends on individual patient factors and the specific infection.

Feature Penicillin / Amoxicillin Clindamycin
First-Line for Strep Yes, highly effective and standard of care No, reserved for specific cases like allergies
Mechanism of Action Inhibits cell wall synthesis Inhibits bacterial protein synthesis
Onset of Symptom Relief 24-48 hours 24-48 hours
Effect on Toxins Can cause toxin release upon cell lysis Inhibits toxin production
Risk of C. difficile Present, but generally lower than clindamycin Higher than many other antibiotics
Cost Generally low Higher than penicillin
Penicillin Allergy Not suitable for allergic patients A primary alternative for allergic patients

Crucial Steps Even After Feeling Better

Completing the entire prescribed course of clindamycin, typically 10 days, is essential for treating strep throat.

Reasons to Finish the Full Course:

  • Prevents Complications: Incomplete treatment can lead to serious issues like rheumatic fever.
  • Ensures Eradication: The full course eliminates all bacteria, preventing recurrence.
  • Reduces Transmission: It helps stop the infection's spread. While typically not contagious after 24 hours of antibiotics, finishing the course ensures the bacteria are gone.
  • Combats Antibiotic Resistance: Incomplete treatment risks developing resistance.

What to Do If Symptoms Don't Improve

If symptoms do not improve within 48 hours of starting clindamycin, consult a healthcare provider. Possible reasons include a viral infection, antibiotic resistance (which is increasing for clindamycin), or an incorrect diagnosis. A doctor can re-evaluate the diagnosis or consider a different antibiotic. Clindamycin may be used with other antibiotics for severe infections to enhance its anti-toxin effects.

Potential Side Effects of Clindamycin

Clindamycin can cause side effects. A significant risk is Clostridioides difficile-associated diarrhea. Other potential side effects include abdominal pain, nausea, vomiting, skin rashes, and a metallic taste.

Conclusion: Clindamycin as a Key Alternative

Clindamycin is an effective treatment for strep throat, particularly for those allergic to penicillin. While symptom improvement, including reduced fever and throat pain, is expected within 1-2 days, it is vital to complete the full prescribed course, usually 10 days, to fully eradicate the infection, prevent its spread, and avoid complications like rheumatic fever. If symptoms do not improve after 48 hours, seek medical attention to rule out resistance or other diagnoses.


Disclaimer: The information provided is for educational purposes only and is not a substitute for professional medical advice. Always consult a qualified healthcare provider for diagnosis and treatment of any medical condition.

Frequently Asked Questions

For most people, a fever associated with strep throat should begin to decrease and break within 24 hours of starting clindamycin treatment.

Clindamycin is primarily used for strep throat when a patient has a severe allergy to penicillin, as it is a safe and effective alternative.

No, it is critical to complete the full 10-day course of clindamycin as prescribed by your doctor. Stopping early can lead to a recurrence of the infection and increase the risk of serious complications like rheumatic fever.

If your symptoms do not improve within 48 hours of starting clindamycin, contact your doctor. It may mean the bacteria are resistant to the antibiotic, the illness is caused by a virus, or an alternative diagnosis is needed.

Clindamycin works by inhibiting bacterial protein synthesis, while amoxicillin inhibits bacterial cell wall synthesis. Clindamycin's protein-inhibiting action also helps reduce the production of bacterial toxins, which is particularly beneficial in severe infections.

Yes, clindamycin can be used in children for strep infections, especially if they have a penicillin allergy. However, the dose will be adjusted based on their weight.

Common side effects include abdominal pain, nausea, vomiting, and a metallic taste. A more serious, though less common, side effect is C. difficile-associated diarrhea.

You are typically no longer contagious after you have been taking clindamycin for at least 24 hours and your fever has resolved.

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Medical Disclaimer

This content is for informational purposes only and should not replace professional medical advice.