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## Overview Zinc is an essential trace mineral vital for immune function, wound healing, DNA synthesis, and cell division. It is available in various formulations, including oral tablets, capsules, syrups, and nasal sprays. The "%2525252525252525252525252525252525252525252525252525252525252520dt" in the drug name is likely a placeholder or artifact and does not represent a specific pharmaceutical form. For clinical use, the specific salt (e.g., zinc sulfate, zinc gluconate, zinc acetate) and formulation must be identified. ## Primary Indications * **Zinc Deficiency:** Treatment and prevention of zinc deficiency, which can arise from inadequate dietary intake, malabsorption (e.g., celiac disease, Crohn's disease), chronic illness, or increased losses. * **Common Cold:** Symptomatic relief of common cold symptoms, particularly when initiated early in the course of illness. * **Wilson's Disease:** Used as adjunctive therapy in patients with Wilson's disease to induce negative copper balance. ## Adult Dosing * **Zinc Deficiency (Treatment):** 200-400 mg elemental zinc daily, divided into 2-3 doses, until deficiency is corrected (typically 2-6 months). * **Zinc Deficiency (Prevention):** 10-25 mg elemental zinc daily. * **Common Cold:** Nasal sprays: Typically 15-25 mg zinc acetate per application, used every 2-3 hours while awake for up to 10 days. Oral lozenges: 10-25 mg elemental zinc every 2-4 hours while awake. *Note: Specific dosing for cold symptom relief can vary significantly between products and may depend on local institutional protocols.* * **Wilson's Disease:** 50 mg elemental zinc three times daily. ## Pediatric Dosing * **Zinc Deficiency (Treatment):** * Infants: 0.5-1 mg/kg/day elemental zinc. * Children 1-8 years: 3-10 mg elemental zinc daily. * Children 9-13 years: 5-15 mg elemental zinc daily. * **Zinc Deficiency (Prevention):** * Infants: 0.5-1 mg/kg/day elemental zinc. * Children 1-8 years: 3-5 mg elemental zinc daily. * Children 9-13 years: 5-10 mg elemental zinc daily. * **Common Cold:** Oral lozenges: Dosing varies widely by product and age; consult product labeling. Nasal formulations are generally not recommended for children due to the risk of anosmia. ## Dose Adjustments No specific dose adjustments are typically required for hepatic or renal impairment, as zinc is primarily eliminated by the kidneys but the degree of impairment requiring adjustment is not well-defined. ## Contraindications * Hypersensitivity to zinc or any component of the formulation. * Nasal zinc formulations are contraindicated for patients who have lost their sense of smell (anosmia) due to the risk of permanent anosmia. ## Adverse Effects * **Gastrointestinal:** Nausea, vomiting, diarrhea, abdominal cramps, metallic taste. These are common and often dose-related. * **Other:** Headache, dizziness, lethargy, skin rash, copper deficiency (with prolonged high-dose therapy). * **Nasal Sprays:** Anosmia (loss of smell), often irreversible. ## Key Drug Interactions * **Quinolone Antibiotics (e.g., ciprofloxacin, levofloxacin):** Zinc can significantly decrease absorption of quinolones. Separate administration by at least 2 hours before or 4-6 hours after zinc. * **Tetracycline Antibiotics:** Zinc can decrease absorption of tetracyclines. Separate administration by at least 2 hours before or 2-3 hours after zinc. * **Penicillamine:** Zinc can reduce absorption and efficacy of penicillamine. Separate administration. * **Thiazide Diuretics:** May increase urinary zinc excretion. ## Monitoring * Monitor for signs and symptoms of zinc deficiency (e.g., impaired immunity, delayed wound healing, hair loss, skin lesions). * Monitor for adverse effects, particularly gastrointestinal upset and signs of copper deficiency with prolonged high-dose therapy (e.g., anemia, neutropenia). * For Wilson's disease, monitor copper levels and clinical response. ## Clinical Pearls * Oral zinc is best absorbed when taken on an empty stomach, but administration with food may reduce gastrointestinal upset. * Nasal zinc formulations carry a significant risk of irreversible anosmia and should be used with extreme caution, if at all. * Long-term, high-dose zinc therapy can lead to copper deficiency. Consider copper supplementation if indicated. * The elemental zinc content varies significantly between different zinc salts (e.g., zinc sulfate 22% elemental, zinc gluconate 14% elemental, zinc acetate 29% elemental). Always calculate doses based on elemental zinc. --- *This information is intended for clinical use and is not a substitute for professional medical advice. Always consult the most current prescribing information and local institutional protocols before making any treatment decisions.*