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# Amoxicillin
## Overview
Amoxicillin is a broad-spectrum penicillin antibiotic used to treat a variety of bacterial infections. It is available in oral formulations, including capsules, tablets, and suspensions.
## Primary Indications
* **Upper Respiratory Tract Infections:** Otitis media, sinusitis, pharyngitis/tonsillitis.
* **Lower Respiratory Tract Infections:** Pneumonia, bronchitis.
* **Skin and Skin Structure Infections:** Cellulitis, impetigo.
* **Urinary Tract Infections:** Cystitis.
* **Helicobacter pylori eradication:** In combination therapy.
* **Prophylaxis against infective endocarditis:** In certain high-risk patients undergoing specific dental procedures.
## Adult Dosing
* **General Infections:** 250-500 mg every 8 hours, or 875 mg every 12 hours.
* **Severe Infections:** Doses may be increased up to 875 mg every 8 hours.
* **H. pylori eradication:** Typically 1000 mg twice daily for 10-14 days in combination with a proton pump inhibitor and another antibiotic.
* **Endocarditis Prophylaxis:** 2 grams as a single dose 30-60 minutes before the procedure.
## Pediatric Dosing
Dosing is typically based on weight and indication. Dosing intervals are usually every 8 or 12 hours.
* **Otitis Media, Sinusitis, Pharyngitis/Tonsillitis:** 25 mg/kg/day divided every 8 hours, or 45 mg/kg/day divided every 12 hours. Maximum daily dose 875 mg.
* **More Severe Infections or infections with less susceptible organisms:** 45 mg/kg/day divided every 8 hours or 80 mg/kg/day divided every 12 hours. Maximum daily dose 4000 mg.
* **H. pylori eradication:** 20-45 mg/kg/day divided twice daily for 10-14 days.
* **Endocarditis Prophylaxis:** 50 mg/kg as a single dose 30-60 minutes before the procedure. Maximum single dose 2 grams.
_Note: Specific pediatric dosing may vary based on local protocols and the severity of infection._
## Dose Adjustments
* **Renal Impairment:** Dose reduction or increased dosing interval is recommended for patients with significant renal impairment (CrCl < 30 mL/min).
## Contraindications
* Known hypersensitivity to amoxicillin, penicillins, or any component of the formulation.
* History of penicillin-associated cholestatic jaundice or hepatic dysfunction.
## Adverse Effects
* **Common:** Diarrhea, nausea, rash (including non-allergic maculopapular rash), vomiting, urticaria.
* **Serious:** Anaphylaxis, Stevens-Johnson syndrome, toxic epidermal necrolysis, Clostridium difficile-associated diarrhea, cholestatic jaundice, hepatic dysfunction.
## Key Drug Interactions
* **Probenecid:** May increase and prolong serum levels of amoxicillin.
* **Allopurinol:** Increased incidence of rash.
* **Oral Contraceptives:** May decrease efficacy.
* **Warfarin:** May alter INR.
* **Methotrexate:** May decrease methotrexate clearance, increasing toxicity risk.
## Monitoring
* Monitor for signs of hypersensitivity reactions (rash, pruritus, anaphylaxis).
* Assess for improvement of infection symptoms.
* Monitor for diarrhea; if severe or persistent, consider C. difficile infection.
* Periodic evaluation of liver and kidney function may be considered in prolonged therapy or in patients with pre-existing conditions.
## Clinical Pearls
* Amoxicillin can be taken with or without food. Taking with food may reduce gastrointestinal upset.
* Shake oral suspensions well before each use. Refrigerate after reconstitution and discard after the specified period (typically 7-14 days).
* Ensure adequate hydration during treatment.
* Advise patients to complete the full course of therapy as prescribed, even if symptoms improve.
* Consider the possibility of cross-reactivity in patients with cephalosporin allergies, though it is generally considered low.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant literature for complete details and to confirm drug information before making clinical decisions.*
