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# Mega CV (Amoxicillin/Potassium Clavulanate)
## Overview
Mega CV is a combination antibiotic consisting of amoxicillin (a beta-lactam) and potassium clavulanate (a beta-lactamase inhibitor). The addition of clavulanate expands the spectrum of amoxicillin to include beta-lactamase-producing organisms.
## Primary Indications
* Bacterial sinusitis
* Community-acquired pneumonia
* Skin and skin structure infections
* Recurrent or persistent acute otitis media
* Urinary tract infections
## Adult Dosing
Standard dosing for respiratory infections is **875 mg/125 mg orally every 12 hours**. For more severe infections, **500 mg/125 mg orally every 8 hours** may be used. The maximum dose is 1750 mg amoxicillin/250 mg clavulanate per day (using high-dose 875/125 tablets twice daily).
## Pediatric Dosing
Dosing is based on the amoxicillin component.
* **Standard dose:** 20–45 mg/kg/day (amoxicillin component) divided every 8–12 hours.
* **Recurrent/Resistant Otitis Media:** Utilize 90 mg/kg/day (based on amoxicillin) divided every 12 hours (typically using 600 mg/5 mL suspension to minimize clavulanate exposure).
* **Maximum:** Do not exceed adult dosing parameters. Weight-based dosing should be calculated by local institutional formulary protocols to ensure the clavulanate component does not exceed 10 mg/kg/day.
## Dose Adjustments
* **Renal Impairment:** Adjustments required for CrCl < 30 mL/min. Contraindicated in hemodialysis patients if using extended-release formulations.
* **Hepatic Impairment:** Use with caution; monitor hepatic function periodically.
## Contraindications
* History of serious hypersensitivity (anaphylaxis) to any penicillin.
* History of cholestatic jaundice or hepatic dysfunction associated with previous amoxicillin/clavulanate use.
## Adverse Effects
* **Common:** Diarrhea (frequently related to clavulanate content), nausea, vomiting, candidiasis.
* **Serious:** Anaphylaxis, Clostridioides difficile-associated diarrhea (CDAD), hepatitis, Stevens-Johnson syndrome.
## Key Drug Interactions
* **Methotrexate:** Amoxicillin may decrease renal elimination, increasing MTX toxicity.
* **Warfarin:** May increase INR; monitor closely during and after therapy.
* **Oral Contraceptives:** May reduce efficacy; recommend barrier protection during therapy.
* **Probenecid:** Increases and prolongs amoxicillin blood levels.
## Monitoring
* Monitor for signs of hypersensitivity.
* Assess liver function tests (LFTs) in patients on prolonged therapy.
* Monitor renal function in patients with pre-existing impairment.
## Clinical Pearls
* **Gastrointestinal Tolerance:** Administer with food to reduce GI side effects.
* **Stripe/Ratio:** Always verify the specific mg ratio of the product, as the clavulanate dose varies. High-dose amoxicillin formulations (e.g., 600 mg/5 mL) contain less clavulanate proportional to amoxicillin to reduce the risk of diarrhea.
* **Spectrum:** Not effective against MRSA or *Pseudomonas aeruginosa*.
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*Disclaimer: This information is for educational purposes only. Always verify current prescribing information, institutional protocols, and patient-specific factors via reliable clinical databases (e.g., Lexicomp, UpToDate) before prescribing or administering medication.*
