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# Mega CV
## Overview
Mega CV is a combination antibiotic consisting of **Amoxicillin** (a beta-lactam) and **Clavulanate Potassium** (a beta-lactamase inhibitor). It is used to overcome resistance in bacteria that produce beta-lactamase enzymes.
## Primary Indications
* Community-acquired pneumonia
* Acute bacterial sinusitis
* Acute otitis media
* Skin and skin-structure infections
* Urinary tract infections (UTIs)
* Dental infections
## Adult Dosing
* **Mild to Moderate Infections:** Amoxicillin 500 mg / Clavulanate 125 mg orally every 8 hours OR Amoxicillin 875 mg / Clavulanate 125 mg orally every 12 hours.
* **Severe Infections:** Amoxicillin 875 mg / Clavulanate 125 mg orally every 8 hours.
* **Max Daily Dose:** Dependent on the specific formulation; generally limit clavulanate content to avoid gastrointestinal distress (max 1750 mg of clavulanate component per day).
## Pediatric Dosing
* **General Rule:** Dosing is based on the amoxicillin component.
* **Standard Dose:** 20 to 45 mg/kg/day (amoxicillin component) in divided doses every 8–12 hours.
* **Recurrent/Resistant Otitis Media:** 90 mg/kg/day (with 6.4 mg/kg/day of clavulanate) given in two divided doses.
* *Note:* Do not use the 875 mg tablet in children weighing <40 kg due to excessive clavulanate load.
## Dose Adjustments
* **Renal Impairment:** Adjustments are required for CrCl <30 mL/min. Do not use the 875 mg tablet in patients with severe renal impairment (CrCl <30 mL/min).
* **Hepatic Impairment:** Use with caution; monitor liver function periodically.
## Contraindications
* Known hypersensitivity to amoxicillin, clavulanate, or any penicillin.
* History of cholestatic jaundice or hepatic dysfunction associated with previous amoxicillin/clavulanate therapy.
## Adverse Effects
* **Common:** Diarrhea (frequently associated with clavulanate content), nausea, vomiting, abdominal pain.
* **Serious:** Pseudomembranous colitis (*C. difficile*), hypersensitivity reactions (anaphylaxis, SJS/TEN), hepatotoxicity (elevated LFTs, cholestatic jaundice).
## Key Drug Interactions
* **Methotrexate:** Amoxicillin may decrease renal clearance, increasing methotrexate toxicity.
* **Warfarin:** May increase INR/bleeding risk; monitor prothrombin time/INR.
* **Probenecid:** Decreases renal tubular secretion of amoxicillin, increasing serum levels.
* **Oral Contraceptives:** Potential for reduced efficacy (use backup contraception).
## Monitoring
* Monitor for signs of hypersensitivity (rash, wheezing).
* Monitor bowel habits for *C. difficile* (severe/persistent diarrhea).
* In prolonged therapy (>2 weeks), monitor renal, hepatic, and hematologic functions.
## Clinical Pearls
* **GI Tolerance:** Administer with a meal or snack to minimize gastrointestinal discomfort.
* **Clavulanate Ratio:** Ratios vary (e.g., 4:1 vs. 7:1). Always check the amoxicillin strength to ensure correct dosing.
* **Suspension Stability:** Reconstituted oral suspensions must be refrigerated and discarded after 10 days.
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**Disclaimer:** This information is for educational purposes only. Clinical protocols and prescribing information can vary by region and current guidelines. Always verify dosing and contraindications via official package inserts, clinical decision support tools (e.g., Lexicomp, UpToDate), or hospital-specific pharmacy protocols before prescribing or administering medication.
