Zimax contains Azithromycin, an acid-stable macrolide antibiotic that is readily absorbed after oral administration. Since it is resistant to degradation by gastric acid, it does not require enteric protection. Absorption is enhanced when taken on an empty stomach, with peak plasma concentrations generally achieved within 2.1–3.2 hours.
Azithromycin is actively transported by phagocytic cells to sites of infection, where high intracellular concentrations are released during phagocytosis. Tissue concentrations may exceed plasma concentrations by more than 50-fold, contributing to prolonged antibacterial activity.
The drug has an extended elimination half-life of approximately 68 hours, allowing convenient once-daily dosing while maintaining therapeutic tissue concentrations for several days. Elimination occurs mainly through biliary excretion as an unchanged drug, with approximately 6% excreted unchanged in urine.
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Azithromycin inhibits bacterial protein synthesis by binding to the 50S ribosomal subunit of susceptible bacteria. This suppresses bacterial growth without interfering with nucleic acid synthesis.
It demonstrates activity against a broad spectrum of susceptible microorganisms, including:
Gram-positive bacteria
Gram-negative bacteria
Other susceptible organisms
The presence of beta-lactamase enzymes does not significantly affect azithromycin activity.
Community-Acquired Pneumonia
Pelvic Inflammatory Disease
When anaerobic pathogens are suspected, an additional antimicrobial with anaerobic coverage should be administered.
The safety and efficacy of injectable azithromycin have not been established in children and adolescents younger than 16 years.
For optimal absorption, administer Zimax at least 1 hour before or 2 hours after meals.
Weight-based dosing:
No dosage adjustment is generally required in patients with mild renal impairment (creatinine clearance >40 mL/min). Use cautiously in patients with severe renal dysfunction due to limited clinical experience.
Because azithromycin is primarily eliminated via the liver, it should not be used in patients with significant hepatic disease.
There is no evidence that Zimax adversely affects the ability to drive or operate machinery.
Azithromycin is classified as Pregnancy Category B. Animal studies have shown no evidence of fetal harm; however, adequate controlled studies in pregnant women are lacking. It should be used during pregnancy only when clearly needed and when the expected benefit outweighs any potential risk.
It is unknown whether azithromycin is excreted into human breast milk. Therefore, caution should be exercised when administering Zimax to breastfeeding mothers.
Rare but serious hypersensitivity reactions, including angioedema and anaphylaxis, have been reported with azithromycin. In some cases, symptoms have recurred despite initial treatment and required prolonged observation and supportive management.
Patients experiencing facial swelling, difficulty breathing, or severe skin reactions should discontinue the medication immediately and seek urgent medical care.
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