India ¡ Malaria Prophylaxis & Treatment ¡ Leptospirosis ¡ Scrub Typhus ¡ Community Pneumonia ¡ Acne ¡ Doxt-S ¡ Doxybact ¡ Microdox
đĻ Malaria prophylaxis (Plasmodium falciparum endemic areas)
đ Leptospirosis (post-flood, agricultural workers)
đĻ Scrub typhus / Orientia (rice fields, North-east India, hills)
đ Brucellosis (livestock workers)
đ Acne â widely used across India
Doxycycline is a broad-spectrum tetracycline antibiotic with a uniquely important role in India due to the country's high burden of vector-borne and zoonotic diseases â particularly malaria, leptospirosis, scrub typhus, brucellosis, and rickettsial infections â for which it is either first-line or the key oral treatment option. Its long half-life allows once or twice daily dosing, and its excellent intracellular penetration makes it effective against obligate intracellular organisms including Rickettsia, Chlamydia, Mycoplasma, and Coxiella burnetii.
Doxycycline 100 mg once daily is the preferred chemoprophylaxis for Plasmodium falciparum malaria in chloroquine-resistant areas â which includes virtually all P. falciparum-endemic areas of India, particularly Northeast India, Jharkhand, Odisha, and parts of Chhattisgarh. Start 1â2 days before travel to endemic area and continue for 4 weeks after leaving. As a treatment component, doxycycline 100 mg twice daily for 7 days is used alongside artesunate (or artemether-lumefantrine) for uncomplicated P. falciparum malaria â not as monotherapy. NVBDCP national guidelines endorse artesunate + doxycycline as one of the recommended regimens for P. falciparum in India.
Scrub typhus (Orientia tsutsugamushi, transmitted by larval trombiculid mites) is one of the most underdiagnosed causes of acute febrile illness in India, particularly in rural and hilly areas of Jammu & Kashmir, Himachal Pradesh, Uttarakhand, Northeast India, Tamil Nadu, and Kerala during the post-monsoon season. It causes a febrile illness with headache, myalgia, and characteristically a painless eschar at the mite bite site â though the eschar is missed in up to 40% of Indian cases. Doxycycline 100 mg twice daily for 5â7 days is dramatically effective â fever typically defervesces within 24â48 hours of starting treatment. In children under 8 years, azithromycin is the alternative.
Leptospirosis (Weil's disease) is endemic in India's coastal, flood-prone, and agricultural regions â particularly during and after the monsoon. Mild leptospirosis: doxycycline 100 mg twice daily for 5â7 days. Post-exposure prophylaxis after high-risk exposure (flood wading, rat contact): doxycycline 200 mg as a single weekly dose. Severe leptospirosis (Weil's disease with jaundice, renal failure, pulmonary haemorrhage): IV penicillin G or IV ceftriaxone â oral doxycycline is not adequate for severe disease.
Doxycycline can cause severe oesophageal ulceration if the tablet dissolves in the oesophagus rather than reaching the stomach. This is one of the most preventable drug complications. Always counsel patients: take doxycycline with a full glass of water (minimum 200ml), remain sitting or standing upright for at least 30 minutes after taking, and never take at bedtime without water. Taking with food or milk is acceptable and reduces GI side effects without significantly reducing absorption.