Doxycycline 100 mg is a broad-spectrum antibiotic from the tetracycline class, used to treat various bacterial infections. It works by inhibiting bacterial protein synthesis, thereby stopping the growth and spread of bacteria. It is widely used in respiratory, urinary, sexually transmitted, and vector-borne infections.

• Effective against Gram-positive and Gram-negative bacteria

• Treats a wide range of infections

• Can be used for malaria prevention in travelers

• Oral administration with high bioavailability

Doxycycline 100 mg is used in the treatment and prevention of:

• Respiratory infections (pneumonia, bronchitis)

• Urinary tract infections (UTIs)

• Sexually transmitted infections (STIs) such as chlamydia

• Acne and skin infections

• Malaria prophylaxis and treatment

• Rickettsial infections (like Rocky Mountain spotted fever)

• Periodontal (gum) disease

• Anthrax (including inhalational anthrax)

• Typical dose: 100 mg once or twice daily

• Best taken with a full glass of water

• Take with food if gastrointestinal upset occurs

• Do not lie down immediately after taking

• Follow the full course even if symptoms improve early

• Not recommended in children under 8 years (may cause tooth discoloration)

• Avoid use in pregnancy and breastfeeding unless directed by a doctor

• Use with caution in patients with liver dysfunction

• Avoid iron supplements, antacids, or dairy products close to dosing time – may reduce absorption

Common side effects:

• Nausea, vomiting

• Diarrhea

• Photosensitivity (increased sunburn risk)

• Loss of appetite

Rare but serious side effects:

• Severe allergic reactions

• Difficulty swallowing or esophageal irritation

• Liver function abnormalities

• Intracranial hypertension (rare)

Seek medical attention if severe or unusual symptoms occur.

• Store at room temperature, below 25°C

• Keep away from moisture and direct sunlight

• Keep out of reach of children

• Do not use expired capsules

Q1: Can I take Doxycycline for viral infections like flu or cold?
No. Doxycycline is an antibiotic, effective only against bacterial infections, not viruses.

Q2: Can I go out in the sun while taking this medicine?
Limit sun exposure and wear protective clothing. Doxycycline can cause sun sensitivity.

Q3: Is it safe to use with other medications?
Inform your doctor about all medications. Avoid iron, calcium, and antacids within 2 hours of taking it.