How many days of amoxicillin do I need for a sinus or ear infection?

How Many Days of Amoxicillin for a Sinus or Ear Infection (and How Long Can You Take Amoxicillin?)

When you’re prescribed amoxicillin for a sinus or ear infection, it’s natural to wonder how long you need to take it—and whether you can safely extend the course. Below is a concise, evidence-based guide drawn from CDC, IDSA and AAP recommendations. Always speak to a doctor if you have concerns, especially about serious or life-threatening symptoms.

Typical Treatment Durations

1. Acute Bacterial Sinusitis
   • Adults: 5–7 days¹
   • Children: 10 days (some clinicians extend to 14 days if symptoms persist)²

2. Acute Otitis Media (Ear Infection)
   • Children under 2 years: 10 days³
   • Children 2–5 years: 7 days³
   • Children 6 years and older, and adults: 5–7 days³

These durations reflect the minimum effective length for most uncomplicated cases. Shorter courses (5–7 days) in older children and adults help reduce side effects and antibiotic resistance, while younger children or severe infections often require a full 10-day course.

Why Course Length Matters

• Ensures all bacteria are eliminated, lowering relapse risk
• Balances benefit against side effects (diarrhea, yeast overgrowth)
• Helps curb antibiotic resistance by avoiding unnecessarily prolonged use

How Long Can You Take Amoxicillin?

Most guidelines cap routine courses at 10–14 days. Extended use beyond this period may be considered only if:

• You have a complicated infection (e.g., chronic sinusitis, mastoiditis)
• Initial therapy fails and a doctor reassesses your case
• You develop a new or worsening illness

If you’re wondering how long can you take amoxicillin safely, talk to your provider before extending past two weeks. They may recommend monitoring for side effects and, in some cases, switching to a different antibiotic.

Dosing Tips

• Standard adult dose for sinusitis: 500 mg every 8 hours or 875 mg every 12 hours
• High-dose regimens (2 g every 12 hours) may be used in areas with high penicillin-resistant bacteria
• Pediatric dosing is weight-based (typically 45–90 mg/kg/day divided into two or three doses)

Always follow your prescription label. Do not skip doses, even if you feel better, and complete the entire course.

Monitoring and Follow-Up

• Re-evaluate if symptoms haven’t improved after 48–72 hours
• Watch for signs of complications, such as:

• High fever lasting more than 3 days
• Severe headache or facial swelling (sinusitis)
• Increasing ear pain, drainage, or hearing loss (ear infection)
  • If you develop rash, difficulty breathing, or severe diarrhea, stop the medication and seek medical help immediately

Side Effects and When to Seek Help

Common side effects:

• Upset stomach, nausea
• Diarrhea or loose stools
• Rash or itching

Less common but serious (seek care right away):

• Allergic reaction (hives, facial swelling, wheezing)
• Severe diarrhea with blood or abdominal pain (possible C. difficile infection)
• Signs of liver or kidney problems (yellowing of eyes, dark urine)

Special Considerations

Pregnancy and breastfeeding
• Generally considered safe in pregnancy (Category B)⁴
• Passes into breast milk—monitor infants for diarrhea or thrush

Kidney impairment
• May require dose adjustment—your doctor will calculate based on creatinine clearance

Gluten-free formulations
• Most amoxicillin products are gluten-free, but always check labels

What If Symptoms Persist?

If you’ve completed the recommended course and still feel unwell, avoid self-extending your antibiotic use. Instead:

• Revisit your healthcare provider for a fresh evaluation
• Consider imaging (e.g., sinus CT) or referral to an ENT specialist
• Explore alternative diagnoses (viral infection, allergies, structural issues)

If you’re uncertain whether your symptoms match those of a bacterial infection, try a free, online symptom check, using the doctor approved Ubie Symptom Checker. This tool can help you decide if and when to seek medical attention.

Key Takeaways

• Acute sinusitis: adults 5–7 days; children 10–14 days
• Acute ear infections: under 2 years = 10 days; 2–5 years = 7 days; 6+ years = 5–7 days
• Do not exceed 10–14 days of amoxicillin without medical advice
• Complete every dose, even if you start feeling better
• Monitor for side effects and worsening symptoms
• Always speak to a doctor about any life-threatening or serious concerns

Antibiotics like amoxicillin are powerful tools—but only when used correctly. If you ever question how long you should stay on your prescription or worry about side effects, reach out to your healthcare provider. Your doctor can tailor the duration and dose to your personal health needs, ensuring you recover safely and effectively.

¹ IDSA Clinical Practice Guideline for Acute Bacterial Rhinosinusitis (2012)
² American Academy of Pediatrics – Sinusitis Policy (2013)
³ American Academy of Pediatrics – Acute Otitis Media Guideline (2013)
⁴ FDA Pregnancy Category B