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# Zinc
## Overview
Zinc is an essential trace element involved in DNA synthesis, protein synthesis, cell division, and immune function. "DT" typically refers to dispersible tablets. It is used as a supplement to prevent deficiency or as an adjunct therapy in specific clinical conditions like diarrhea.
## Primary Indications
* Treatment of zinc deficiency (acrodermatitis enteropathica, malabsorption, prolonged parenteral nutrition).
* Adjunctive therapy for acute diarrhea (WHO/UNICEF recommendation).
* Supportive care for wound healing (if deficiency is present).
## Adult Dosing
* **Deficiency:** 25–50 mg elemental zinc daily.
* **Acute Diarrhea:** 20 mg elemental zinc daily for 10–14 days.
* **Maximum Dose:** Avoid exceeding 40 mg of elemental zinc daily for long-term use unless directed by a specialist, due to risk of copper deficiency.
## Pediatric Dosing
* **Acute Diarrhea (WHO Guidelines):**
* **Infants <6 months:** 10 mg elemental zinc daily for 10–14 days.
* **Children ≥6 months:** 20 mg elemental zinc daily for 10–14 days.
* **Deficiency:** Dosage varies by age and severity; typically 0.5–1.0 mg/kg/day elemental zinc.
## Dose Adjustments
* **Renal Impairment:** No formal adjustments, but monitor for accumulation in end-stage renal disease.
* **Hepatic Impairment:** No formal adjustments.
* **Copper Deficiency:** Supplementation may be required if high-dose zinc is used long-term (>50 mg/day).
## Contraindications
* Hypersensitivity to zinc salts.
* Avoid high doses in patients with copper deficiency (zinc induces metallothionein, which traps copper in the gut, reducing absorption).
## Adverse Effects
* **Common:** Nausea, vomiting, metallic taste, abdominal cramps, diarrhea.
* **Serious (Long-term/High-dose):** Copper deficiency (leading to sideroblastic anemia and neutropenia), reduced HDL cholesterol, immune suppression.
## Key Drug Interactions
* **Fluoroquinolones & Tetracyclines:** Zinc forms insoluble chelates; administer antibiotics at least 2 hours before or 4–6 hours after zinc.
* **Penicillamine:** Zinc decreases absorption.
* **Iron Supplements:** Concurrent high-dose iron may compete with zinc for absorption.
## Monitoring
* **Short-term:** Baseline serum zinc levels if deficiency is suspected (note: serum levels reflect total body status poorly).
* **Long-term:** Monitor copper levels and complete blood count (CBC) if supplementing >40 mg/day for extended periods.
## Clinical Pearls
* **Elemental Content:** Always check the label. The "DT" formulation provides a specific amount of *elemental* zinc; ensure the dose reflects elemental content, not the weight of the salt (e.g., Zinc Gluconate vs. Zinc Sulfate).
* **Administration:** Take with food if GI upset occurs, though absorption may be slightly better on an empty stomach.
* **Local Protocol:** Always adhere to institutional or national protocols (e.g., WHO/UNICEF standardized pediatric diarrhea kits) as these may supersede general dosing guidelines.
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**Educational Disclaimer:** This information is intended for educational purposes for healthcare professionals. Clinical practice varies by region and institution. Always verify dosages, contraindications, and drug-drug interactions using current, localized prescribing information and institutional protocols before implementation.
