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# Zinc
## Overview
Zinc is an essential trace element involved in DNA synthesis, protein production, and immune function. Zinc dispersible tablets (DT) are commonly used for oral supplementation to treat deficiencies or as an adjunct therapy in acute diarrhea (WHO/UNICEF guidelines).
## Primary Indications
* Treatment of zinc deficiency.
* Adjunct therapy for acute diarrhea (especially in children in resource-limited settings).
* Maintenance therapy for conditions like Acrodermatitis enteropathica.
## Adult Dosing
* **Deficiency:** 25–50 mg (elemental zinc) orally daily.
* **Maintenance:** 15–20 mg (elemental zinc) orally daily.
* *Note:* Tolerable Upper Intake Level (UL) for adults is 40 mg/day; higher doses should only be used under medical supervision for specific clinical conditions.
## Pediatric Dosing
* **Acute Diarrhea (WHO Recommendation):**
* 6 months to 5 years: 20 mg (elemental zinc) orally once daily for 10–14 days.
* Under 6 months: 10 mg (elemental zinc) orally once daily for 10–14 days.
* **Deficiency:** Dosage varies significantly based on age and severity; consult institutional protocols or pediatric weight-based guidelines.
## Dose Adjustments
* **Renal/Hepatic Impairment:** No standard adjustment, but use caution in patients with severe renal failure as zinc is excreted via feces/urine; long-term high-dose therapy may require monitoring.
## Contraindications
* Hypersensitivity to zinc salts.
* Avoid high-dose supplementation in patients with known copper deficiency (to prevent exacerbation).
## Adverse Effects
* **Common:** Nausea, vomiting, metallic taste, epigastric pain, diarrhea.
* **Serious (Long-term, high-dose):** Copper deficiency (leading to anemia or neutropenia), impaired immune function, and reduced HDL cholesterol.
## Key Drug Interactions
* **Antibiotics:** Zinc reduces absorption of tetracyclines and fluoroquinolones (separate doses by at least 2–4 hours).
* **Penicillamine:** Zinc reduces absorption of penicillamine; space doses by at least 2 hours.
* **Calcium/Iron:** High-dose calcium or iron may interfere with zinc absorption.
## Monitoring
* **Serum Zinc levels:** Not always reliable as zinc is primarily intracellular.
* **Clinical Status:** Monitor for resolution of diarrhea or signs of deficiency (dermatitis, alopecia).
* **Long-term:** Monitor copper status and CBC if high-dose therapy (>40 mg/day) continues beyond a few weeks.
## Clinical Pearls
* **Dispersible Tablets:** Should be dissolved in a small amount of clean water or breast milk before administration to infants/small children.
* **GI Tolerance:** Taking zinc with food can reduce nausea, although this may slightly decrease absorption.
* **Zinc/Copper Balance:** Chronic zinc supplementation (even at moderate doses) can deplete copper stores; consider copper supplementation if long-term high-dose zinc is required.
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*Disclaimer: This information is for educational purposes for healthcare professionals. Clinical protocols may vary by institution. Always verify specific dosing, safety precautions, and regional guidelines via current prescribing information (e.g., FDA labels, package inserts, or NNF/WHO resources) before prescribing or administering medication.*
