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## Zinc Sulfate ### Overview Zinc sulfate is an essential mineral that plays a vital role in numerous metabolic processes, including immune function, wound healing, and protein synthesis. It is available in oral and topical formulations. ### Primary Indications * **Zinc Deficiency:** Treatment and prevention of zinc deficiency, which can arise from inadequate dietary intake, malabsorption syndromes, or increased losses. * **Wilson's Disease:** As an adjunct therapy to chelation therapy for Wilson's disease, to prevent copper reabsorption. * **Diarrhea (Pediatric):** WHO-recommended adjunct treatment for acute diarrhea in children. ### Adult Dosing * **Zinc Deficiency Treatment:** 220 mg of zinc sulfate (equivalent to 50 mg elemental zinc) orally once daily. Higher doses may be required in severe deficiency or malabsorption, up to 220 mg of zinc sulfate (50 mg elemental zinc) three times daily. * **Wilson's Disease Adjunct:** 220 mg of zinc sulfate (50 mg elemental zinc) orally three times daily. * **Pediatric Diarrhea (WHO):** For children 6 months and older: 20 mg elemental zinc (equivalent to 110 mg zinc sulfate) orally once daily for 10-14 days. For children younger than 6 months: 10 mg elemental zinc (equivalent to 55 mg zinc sulfate) orally once daily for 10-14 days. ### Pediatric Dosing * **Zinc Deficiency Treatment:** Dosing is typically based on elemental zinc. * Infants up to 6 months: 1 mg elemental zinc (equivalent to 5.5 mg zinc sulfate) orally once daily. * Children 7 months to 3 years: 3 mg elemental zinc (equivalent to 16.5 mg zinc sulfate) orally once daily. * Children 4 to 8 years: 5 mg elemental zinc (equivalent to 27.5 mg zinc sulfate) orally once daily. * Children 9 to 13 years: 8 mg elemental zinc (equivalent to 44 mg zinc sulfate) orally once daily. * Adolescents 14 to 18 years: * Females: 9 mg elemental zinc (equivalent to 49.5 mg zinc sulfate) orally once daily. * Males: 11 mg elemental zinc (equivalent to 60.5 mg zinc sulfate) orally once daily. * Higher doses may be used for established deficiency, guided by clinical response and laboratory values. ### Dose Adjustments No specific dose adjustments are typically required for hepatic or renal impairment, as zinc is not significantly metabolized or renally excreted. However, monitoring for adverse effects is prudent in patients with significant organ dysfunction. ### Contraindications * Hypersensitivity to zinc sulfate or any component of the formulation. ### Adverse Effects * **Gastrointestinal:** Nausea, vomiting, diarrhea, abdominal cramps, constipation, metallic taste. * **Other:** Headache, fatigue, rash. High doses can lead to copper deficiency. ### Key Drug Interactions * **Tetracyclines and Quinolone Antibiotics:** Zinc sulfate can reduce the absorption of these antibiotics. Administer zinc sulfate at least 2 hours before or 4-6 hours after these antibiotics. * **Thiazide Diuretics:** May increase urinary zinc excretion. * **Penicillamine:** Zinc sulfate can reduce the absorption of penicillamine. Separate administration by at least 2 hours. * **Iron Supplements:** High doses of iron can interfere with zinc absorption. ### Monitoring * **For Deficiency Treatment:** Monitor for resolution of symptoms, weight gain, improved immune function, and laboratory parameters if baseline levels were known. * **For Wilson's Disease:** Monitor for changes in liver function tests and serum copper levels, as guided by the treating physician. * **For Long-Term High-Dose Therapy:** Monitor for signs and symptoms of copper deficiency (e.g., anemia, neutropenia, neurological abnormalities). ### Clinical Pearls * Elemental zinc content varies by formulation; always calculate dosage based on elemental zinc if possible. * Administer oral zinc sulfate with food to minimize gastrointestinal upset, but be aware this may slightly reduce absorption. However, absorption is significantly impacted by other medications. * For pediatric diarrhea, the WHO recommends continuing zinc therapy for 10-14 days, even after diarrhea resolves, as it can shorten the duration and severity of future episodes. * Topical zinc oxide (a related compound) is commonly used for diaper rash and skin protection; this information pertains to zinc sulfate. *** *Disclaimer: This information is intended for healthcare professionals and does not substitute for professional medical advice. Always consult the most current prescribing information and a qualified healthcare provider for any medical condition or treatment. Dosing and recommendations can vary based on patient-specific factors and local protocols.*