Azithromycin

Zithromax Azithromycin 250mg Antibiotic 6 Tablets

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Zithromax (azithromycin) — Pfizer's macrolide antibiotic for bacterial infections of the respiratory tract, sinuses, throat, and skin. Short 3–5 day course.
💊 Active ingredient: Azithromycin (macrolide group)
⏱️ Dosing: Once daily, 3–5 day course
🍽️ With food: May be taken with or without food
📦 Pack: 6 tablets per box (250 mg each)
⚡ Advantage: Pfizer originator brand, long-acting half-life 68 hrs, shorter course than most antibiotics
🌡️ Storage: Below 30°C, away from moisture

ตัวเลือก: 1 กล่อง (6 เม็ด)
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Product Description

Zithromax (azithromycin) is a macrolide antibiotic with Azithromycin 250 mg as its active ingredient. It works by binding to the bacterial 50S ribosomal subunit, inhibiting protein synthesis and stopping bacterial growth. With a short 3–5 day course taken once daily, Zithromax is designed for convenience and patient compliance. See all antibiotics in the Antibiotic collection.

📊 Key statistics

  • Azithromycin has an exceptionally long half-life of 68 hours, enabling once-daily dosing and a shorter treatment course compared to most antibiotics
  • Studies show azithromycin treats Chlamydia trachomatis with a single 1 g dose at a 97% success rate (CDC, 2021)
  • The WHO includes Azithromycin on its Essential Medicines List for community-acquired pneumonia and STIs
  • Azithromycin accumulates in tissues at concentrations 10–100× higher than plasma levels, sustaining antibacterial activity after the last dose

🏭 Zithromax is the originator brand by Pfizer Inc., a world-leading pharmaceutical company. It meets international GMP standards and is registered with Thailand's Food and Drug Administration (FDA). Azithromycin is currently available in over 80 countries worldwide.

⚠️ Zithromax treats bacterial infections only. It does not work against viral illnesses such as the common cold, influenza, or COVID-19. It should not be used by individuals with a known allergy to macrolide antibiotics or azithromycin.

Intimo Life Content Team

Medically reviewed by

Intimo Life Content Team | Sources: NHS, PubMed/StatPearls, RxList, Pfizer Inc.

Last reviewed: 2026-06-24

About Zithromax

What Is Zithromax (Azithromycin)?

Zithromax is a macrolide antibiotic with Azithromycin as its active ingredient, developed and marketed by Pfizer Inc. It is one of the most widely prescribed antibiotics worldwide for treating bacterial infections.

Azithromycin works by binding to the bacterial 50S ribosomal subunit, inhibiting protein synthesis so bacteria cannot replicate and eventually die. This mechanism differs from beta-lactam antibiotics like Augmentin, which attack the cell wall — giving azithromycin a distinct and broad spectrum of coverage.

A key advantage of Azithromycin is its exceptionally long half-life of 68 hours, allowing the drug to accumulate at high concentrations in infected tissue and continue working even after the last dose. This is why the Zithromax treatment course is only 3–5 days.

Zithromax comes as a 250 mg tablet, 6 tablets per box, suitable for adults seeking a convenient short-course antibiotic treatment.

What Does Azithromycin 250 mg Treat?

Azithromycin 250 mg treats a range of bacterial infections, including:

  • Upper respiratory tract: Pharyngitis, tonsillitis, sinusitis
  • Lower respiratory tract: Bronchitis, community-acquired pneumonia (CAP)
  • Skin and soft tissue: Bacterial skin infections, infected wounds
  • Sexually transmitted infections: Chlamydia trachomatis (at a special single 1 g dose)
  • Otitis media (middle ear infection): In selected cases as determined by a physician

Zithromax cannot treat viral infections such as the common cold, influenza, COVID-19, or RSV. Using antibiotics for viral illnesses is ineffective and contributes to antimicrobial resistance.

How to Take Zithromax / Dosage

Standard adult azithromycin dosing:

  • Day 1: 500 mg (2 tablets × 250 mg) once daily
  • Days 2–5: 250 mg (1 tablet × 250 mg) once daily
  • Or 500 mg once daily for 3 days as prescribed by your doctor

💊 How to take Zithromax:

  • May be taken with or without food — absorption is not affected
  • Take at the same time each day to maintain consistent drug levels
  • Swallow tablets whole with water — do not crush or split
  • Complete the full course even if you feel better, to prevent antibiotic resistance

⚠️ For Chlamydia treatment: Your doctor may prescribe a single 1 g (4 tablet) dose — this differs from the respiratory infection regimen. Always follow your physician's instructions.

Intimo Life carries Zithromax 250 mg, 6 tablets per box — contact the Intimo Life team for more information.

Side Effects of Zithromax

Azithromycin is generally well tolerated. Common side effects include:

  • Gastrointestinal (most common): Nausea, vomiting, diarrhea, abdominal pain — occurring in 5–15% of users
  • Headache: Occurs infrequently and is usually mild
  • Skin rash: Rare; discontinue immediately if severe

Side effects requiring immediate medical attention:

  • Palpitations or irregular heartbeat (azithromycin may prolong QT interval in some individuals)
  • Severe allergic reaction: facial swelling, tongue swelling, difficulty breathing
  • Yellowing of skin or eyes (sign of liver dysfunction)
  • Severe or persistent diarrhea after stopping (may indicate C. difficile infection)

💡 Taking the tablet with food may help reduce gastrointestinal side effects, even though it is not required.

Contraindications / Precautions

Contraindications for Azithromycin:

  • Known allergy to azithromycin or other macrolide antibiotics such as erythromycin or clarithromycin
  • History of QT prolongation or ventricular arrhythmia
  • Concurrent use of QT-prolonging drugs such as antiarrhythmic agents

Precautions:

  • Liver and kidney function: Use with caution in patients with hepatic or renal impairment
  • Myasthenia gravis: Azithromycin may exacerbate muscle weakness in affected patients
  • Elderly patients: Monitor closely, particularly for cardiac effects
  • Pregnancy and breastfeeding: Use only when benefits outweigh risks, at physician discretion
  • Drug interactions: Warfarin, Digoxin, Cyclosporine — inform your doctor or pharmacist before use

Zithromax vs Other Antibiotics

Comparing Zithromax (Azithromycin) with other antibiotics available at Intimo Life:

Zithromax (Azithromycin 250 mg) — Macrolide

  • Coverage: Respiratory tract, skin, STI (Chlamydia)
  • Course: 3–5 days, once daily
  • Advantage: Shortest course, food-independent, 68-hr half-life

Augmentin (Amoxicillin + Clavulanic Acid) — Beta-lactam

  • Coverage: Respiratory, sinuses, skin, UTI, animal bites
  • Course: 5–10 days, 2–3× daily
  • Advantage: Covers beta-lactamase-resistant bacteria

B-Ciprofloxacin (Ciprofloxacin) — Fluoroquinolone

  • Coverage: UTI, GI tract, respiratory tract
  • Course: 3–14 days, twice daily
  • Advantage: Broad gram-negative coverage, ideal for UTI

Quick summary: Choose Zithromax for a short, convenient course treating respiratory or Chlamydia infections — choose Augmentin when resistant bacteria or animal bites are suspected — choose B-Ciprofloxacin for urinary tract or gastrointestinal infections.

How Fast Does Zithromax Work?

After taking Azithromycin, the drug is rapidly absorbed into the bloodstream:

  • First 1–3 hours: Peak blood concentration reached (Tmax ~2.5 hrs)
  • 24–48 hours: Most infection symptoms begin to noticeably improve — fever subsides, throat pain reduces
  • 3–5 days: Course completed, but azithromycin continues working in tissues for several additional days due to its 68-hour half-life

Important: Even if you feel better within 1–2 days, always complete the full course. Stopping early may allow remaining bacteria to develop resistance.

If symptoms do not improve within 72 hours or worsen, consult a doctor — the infection may require a different antibiotic or further evaluation.

Where to Buy Zithromax?

Buy Zithromax Online at Intimo Life

Intimo Life carries Zithromax (Azithromycin 250 mg), 6 tablets per box. Orders ship discreetly throughout Thailand with plain packaging — no product name on the parcel. Shop online conveniently without visiting a pharmacy in person.

⚠️ Disclaimer

The content in this article is for general educational purposes only. It is not intended to replace professional advice, diagnosis, or treatment from a doctor or pharmacist. If you have any questions about symptoms or medication use, always consult a doctor or pharmacist first.

References

  1. NHS UK — Azithromycin (accessed June 2026)
  2. StatPearls / PubMed — Azithromycin (NBK557790) (accessed June 2026)
  3. RxList — Zithromax (Azithromycin) Drug Information (accessed June 2026)
  4. Pfizer Inc. — Zithromax Prescribing Information (US Label, 2023)

Frequently Asked Questions

Azithromycin is a macrolide antibiotic that inhibits bacterial protein synthesis by binding to the 50S ribosomal subunit, stopping bacterial replication. Its 68-hour half-life enables once-daily dosing with a short 3–5 day course. Zithromax is the originator brand manufactured by Pfizer Inc.

Zithromax can be taken with or without food — food does not significantly affect azithromycin absorption. However, if you experience nausea, taking it with food may help reduce discomfort.

Most symptoms begin to improve within 24–48 hours. However, you must complete the full 3–5 day course to fully eliminate the bacteria. If you do not improve within 72 hours, consult a doctor.

Take the missed dose as soon as you remember. However, if it is close to the next scheduled dose (within 2–3 hours), skip the missed dose and continue with the regular schedule. Never double the dose as this may increase side effects.

Azithromycin is available in pediatric suspension form, dosed by body weight and under physician supervision. The Zithromax 250 mg tablets sold at Intimo Life are intended for adults only.

It is best to avoid alcohol while taking Azithromycin. Although there is no severe direct drug interaction, alcohol can impair the immune response and slow recovery. Both alcohol and azithromycin may also increase gastrointestinal side effects.

Mild diarrhea is a common side effect of Azithromycin, as the drug stimulates motilin receptors in the gut, speeding intestinal motility. This typically resolves after completing the course. If diarrhea is severe, contains blood, or persists days after stopping, seek medical attention.

Azithromycin 250 mg is available at pharmacies and online at Intimo Life, which carries genuine Zithromax by Pfizer — 6 tablets per box, with discreet nationwide shipping across Thailand.

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