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# Zinc Sulfate ## Overview Zinc sulfate is an essential mineral that plays a vital role in numerous physiological processes, including immune function, wound healing, DNA synthesis, and cell division. ## Primary Indications * Treatment and prevention of zinc deficiency. * Adjunctive therapy in conditions associated with increased zinc loss or malabsorption (e.g., diarrhea, Crohn's disease, Wilson's disease). * Supportive care in parenteral nutrition. * Certain dermatological conditions (e.g., acne vulgaris, alopecia areata). ## Adult Dosing * **Zinc Deficiency:** Recommended daily allowance (RDA) varies by age and sex, but typical therapeutic doses range from 50-150 mg elemental zinc per day, divided into 1-3 doses. The duration of therapy depends on the severity and resolution of deficiency. * **Parenteral Nutrition:** Typically 2.5-5 mg elemental zinc per day. Higher doses may be needed in catabolic states or significant GI losses. * **Acne Vulgaris:** 30-100 mg elemental zinc per day. * **Wilson's Disease (as maintenance therapy after initial chelation):** 50 mg elemental zinc three times daily. ## Pediatric Dosing * **Zinc Deficiency:** Dosing is based on elemental zinc. * Infants (0-6 months): 2 mg/day * Infants (7-12 months): 3 mg/day * Children (1-3 years): 3 mg/day * Children (4-8 years): 5 mg/day * Children (9-13 years): 8 mg/day * Adolescents (14-18 years, male): 11 mg/day * Adolescents (14-18 years, female): 9 mg/day * **Therapeutic doses for confirmed deficiency in children are typically higher and may range from 1-2 mg/kg/day up to a maximum of 50 mg/day, depending on age and severity. Consult specific pediatric guidelines.** * **Parenteral Nutrition:** Typically 0.1 mg/kg/day, not to exceed 5 mg/day. ## Dose Adjustments * **Renal Impairment:** Use with caution. Zinc is renally excreted. Dose reduction may be necessary, particularly in severe impairment. Monitor serum zinc levels. * **Hepatic Impairment:** No specific dose adjustment, but monitor for potential effects on copper metabolism. ## Contraindications * Hypersensitivity to zinc sulfate or any component of the formulation. * Avoid in patients with primary zinc malabsorption or certain genetic disorders of zinc metabolism without expert guidance. ## Adverse Effects * **Gastrointestinal:** Nausea, vomiting, diarrhea, abdominal pain, metallic taste. Taking with food can mitigate GI upset. * **Other:** Headache, dizziness, lethargy, potential for copper deficiency with prolonged high-dose therapy. ## Key Drug Interactions * **Quinolone Antibiotics (e.g., ciprofloxacin, levofloxacin):** Zinc sulfate can reduce the absorption of quinolones. Separate administration by at least 2 hours before or 4-6 hours after zinc. * **Tetracycline Antibiotics (e.g., doxycycline, minocycline):** Zinc sulfate can reduce the absorption of tetracyclines. Separate administration by at least 2 hours before or 2-3 hours after zinc. * **Penicillamine:** Zinc sulfate can reduce the absorption of penicillamine. Separate administration by at least 2 hours. * **Thiazide Diuretics:** May increase urinary zinc excretion. ## Monitoring * **Clinical Signs and Symptoms:** Monitor for improvement of deficiency symptoms (e.g., skin lesions, impaired taste, poor wound healing, diarrhea). * **Serum Zinc Levels:** Can be helpful in assessing zinc status, though interpretation can be complex due to diurnal variations and other factors. Target levels vary. * **Copper Levels:** Monitor for signs of copper deficiency (e.g., anemia, neutropenia) with prolonged high-dose zinc therapy. ## Clinical Pearls * Zinc is best absorbed on an empty stomach, but taking with food can reduce gastrointestinal upset. * Elemental zinc content varies significantly between different zinc salt formulations (e.g., zinc sulfate, zinc gluconate, zinc citrate). Always dose based on **elemental zinc**. * Long-term, high-dose zinc supplementation (>50 mg elemental zinc/day) can lead to copper deficiency. * Ensure adequate fluid intake, especially during diarrheal episodes. --- **Disclaimer:** This information is intended for healthcare professionals. Please verify current prescribing information and consult relevant clinical guidelines before making any treatment decisions.