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Doxycycline Uses, Dosage, Side Effects & Warnings | DrugsAtlas

Authoritative Clinical Reference

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Therapeutic Class
Antibacterial
Subclass
Tetracycline antibiotic
Speciality
Infectious Diseases
Schedule (India)
Schedule H
Routes
Oral, Intravenous
Formulations
Form Strengths
Capsules 100 mg
Tablets 100 mg
Dispersible tablets 100 mg
Tablets (extended-release) 40 mg (sub-antimicrobial dose for rosacea)
Injection (powder for reconstitution) 100 mg/vial
Adult indications

INDICATIONS + DOSING — FOR CLINICIAN USE ONLY

Primary Indications (Approved / Standard in India)


1. Scrub Typhus / Rickettsial Infections
Parameter Recommendation
Starting dose 100 mg twice daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily
Maximum dose 200 mg/day
Duration 7 days (extend to 14 days if severe or delayed response)
Clinical notes First-line therapy per ICMR/NCDC guidelines; continue until afebrile for 48–72 hours; highly endemic in Himalayan foothills, NE India, South India

2. Cholera
Parameter Recommendation
Starting dose 300 mg single dose OR 100 mg twice daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily if multi-dose regimen
Maximum dose 300 mg/day
Duration Single dose or 3 days
Clinical notes Adjunct to ORS; reduces stool output and vibrio shedding; per NCDC outbreak guidelines

3. Uncomplicated Genital Chlamydia Infection
Parameter Recommendation
Starting dose 100 mg twice daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily
Maximum dose 200 mg/day
Duration 7 days
Clinical notes First-line per NACO STI guidelines; treat partner simultaneously; test-of-cure not routinely needed

4. Non-Gonococcal Urethritis / Cervicitis
Parameter Recommendation
Starting dose 100 mg twice daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily
Maximum dose 200 mg/day
Duration 7 days
Clinical notes Covers Chlamydia and Mycoplasma genitalium; combine with ceftriaxone if gonorrhoea not excluded

5. Pelvic Inflammatory Disease (PID)
Parameter Recommendation
Starting dose 100 mg twice daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily
Maximum dose 200 mg/day
Duration 14 days
Clinical notes Use with ceftriaxone 250 mg IM single dose ± metronidazole 500 mg twice daily; per NACO syndromic management guidelines

6. Leptospirosis (Mild–Moderate)
Parameter Recommendation
Starting dose 100 mg twice daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily
Maximum dose 200 mg/day
Duration 7 days
Clinical notes Effective if started within first 4 days of illness; IV penicillin preferred for severe/icteric disease

7. Brucellosis
Parameter Recommendation
Starting dose 100 mg twice daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily
Maximum dose 200 mg/day
Duration 6 weeks
Clinical notes Always combine with streptomycin (first 2–3 weeks) OR rifampicin (full 6 weeks); monotherapy leads to high relapse

8. Malaria Chemoprophylaxis
Parameter Recommendation
Starting dose 100 mg once daily
Titration Not applicable
Usual maintenance dose 100 mg once daily
Maximum dose 100 mg/day
Duration Start 1–2 days before travel; continue during stay + 4 weeks after leaving endemic area
Clinical notes Use when mefloquine/atovaquone-proguanil contraindicated or unavailable; not for treatment of acute malaria as monotherapy

9. Severe Malaria (Adjunct Therapy)
Parameter Recommendation
Starting dose 100 mg twice daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily
Maximum dose 200 mg/day
Duration 7 days
Clinical notes Always combine with IV artesunate or quinine; never use as monotherapy; per NVBDCP guidelines

10. Acne Vulgaris (Moderate–Severe Inflammatory)
Parameter Recommendation
Starting dose 100 mg once daily OR 50 mg twice daily
Titration Not applicable
Usual maintenance dose 50–100 mg once daily
Maximum dose 100 mg/day
Duration 6–12 weeks (reassess; avoid prolonged use >3–4 months)
Clinical notes Second-line after topical therapy fails; combine with topical retinoid and benzoyl peroxide; taper to sub-antimicrobial dose or stop once controlled

11. Rosacea (Papulopustular)
Parameter Recommendation
Starting dose 40 mg once daily (modified-release) OR 50 mg once daily (immediate-release)
Titration Not applicable
Usual maintenance dose 40–50 mg once daily
Maximum dose 100 mg/day (if 40 mg insufficient)
Duration 8–16 weeks
Clinical notes Sub-antimicrobial dosing preferred to minimise resistance; combine with topical metronidazole or azelaic acid

12. Community-Acquired Pneumonia (Atypical Pathogens)
Parameter Recommendation
Starting dose 100 mg twice daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily
Maximum dose 200 mg/day
Duration 7–14 days
Clinical notes Covers Mycoplasma, Chlamydophila, Legionella; use as monotherapy only for mild atypical pneumonia; combine with beta-lactam for moderate–severe CAP

13. Q Fever (Coxiella burnetii)
Parameter Recommendation
Starting dose 100 mg twice daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily
Maximum dose 200 mg/day
Duration Acute: 14 days; Chronic (endocarditis): 18–24 months with hydroxychloroquine
Clinical notes Chronic Q fever requires specialist management; add hydroxychloroquine to enhance intracellular killing

14. Plague (Yersinia pestis)
Parameter Recommendation
Starting dose 100 mg twice daily OR 200 mg once daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily
Maximum dose 200 mg/day
Duration 10–14 days
Clinical notes Alternative to streptomycin/gentamicin; per NCDC outbreak protocols; strict infection control required

15. Anthrax (Post-Exposure Prophylaxis & Cutaneous)
Parameter Recommendation
Starting dose 100 mg twice daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily
Maximum dose 200 mg/day
Duration PEP: 60 days; Cutaneous: 7–10 days
Clinical notes Ciprofloxacin is alternative first-line; for inhalational/systemic anthrax, use IV doxycycline in multidrug regimen

16. Lymphogranuloma Venereum (LGV)
Parameter Recommendation
Starting dose 100 mg twice daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily
Maximum dose 200 mg/day
Duration 21 days
Clinical notes Per NACO guidelines; azithromycin is alternative; aspirate fluctuant buboes (do not incise)

17. Granuloma Inguinale (Donovanosis)
Parameter Recommendation
Starting dose 100 mg twice daily
Titration Not applicable
Usual maintenance dose 100 mg twice daily
Maximum dose 200 mg/day
Duration Minimum 3 weeks; continue until complete epithelialisation
Clinical notes Endemic in parts of India; azithromycin is alternative; prolonged treatment often required

18. Periodontitis (Adjunctive Therapy)
Parameter Recommendation
Starting dose 20 mg twice daily (sub-antimicrobial dose)
Titration Not applicable
Usual maintenance dose 20 mg twice daily
Maximum dose 40 mg/day
Duration Up to 9 months
Clinical notes Adjunct to scaling/root planing; anti-collagenase effect at sub-antimicrobial dose; does not promote resistance

Secondary Indications — Adults (Off-label)

MRSA skin/soft tissue infection 100 mg twice daily 5–10 days RCT data; Indian dermatology practice OFF-LABEL; alternative when TMP-SMX unavailable
Small intestinal bacterial overgrowth (SIBO)
100 mg twice daily 7–10 days Limited RCT data OFF-LABEL; Specialist only; when rifaximin unavailable
Early Lyme disease (if documented travel history)
100 mg twice daily 14–21 days International guidelines; rare in India OFF-LABEL; very rare in India; confirm exposure history
Ehrlichiosis / Anaplasmosis
100 mg twice daily 7–14 days Case reports; travel-related OFF-LABEL; empiric for tick-borne illness with travel history
Pleural effusion sclerotherapy
500 mg in 30–50 mL NS intrapleurally Single instillation RCTs; Indian pulmonology practice OFF-LABEL; Specialist only; for recurrent malignant effusions
Bullous pemphigoid (steroid-sparing)
100–200 mg/day Months RCT evidence (BLISTER trial) OFF-LABEL; Specialist only; with topical steroids
Chronic prostatitis (Category II/III)
100 mg twice daily 4–6 weeks Urology practice OFF-LABEL; when atypical organisms suspected
Paediatric indications

PAEDIATRIC DOSING (Specialist Only)

⚠️ Age Restriction

  • Generally avoided in children <8 years due to risk of permanent teeth staining and enamel hypoplasia
  • Exception: May be used in children <8 years for life-threatening infections (scrub typhus, Rocky Mountain spotted fever, anthrax, severe malaria) when benefits outweigh risks — specialist supervision mandatory
  • Recent evidence suggests short courses (≤21 days) may have minimal dental effects, but caution persists in Indian practice

Weight-Based Dosing (Children ≥8 years)

Weight Category Loading Dose (Day 1) Maintenance Dose Maximum Daily Dose
<45 kg 4 mg/kg (divided q12h) 2–4 mg/kg/day (single or divided) 200 mg/day
≥45 kg Adult dosing applies 100 mg once or twice daily 200 mg/day

Primary Paediatric Indications

1. Scrub Typhus / Rickettsial Disease
Parameter Children ≥8 years Children <8 years (life-threatening only)
Dose 2.2 mg/kg twice daily (max 100 mg/dose) 2.2 mg/kg twice daily (max 100 mg/dose)
Duration 7 days or until afebrile 48–72 hours 5–7 days (shortest effective course)
Notes First-line per IAP/ICMR Specialist only; benefits outweigh dental risk in severe disease
2. Malaria Chemoprophylaxis
Parameter Recommendation
Minimum age ≥8 years
Dose 2 mg/kg once daily (max 100 mg)
Duration 1–2 days before travel through 4 weeks after
Notes Alternative when atovaquone-proguanil unavailable
3. Severe Malaria (Adjunct)
Parameter Recommendation
Age ≥8 years (or <8 years if benefits outweigh risks)
Dose 2.2 mg/kg twice daily (max 100 mg/dose)
Duration 7 days
Notes Always combine with IV artesunate; never monotherapy
4. Cholera
Parameter Recommendation
Age ≥8 years
Dose 2–4 mg/kg/day in single or divided doses
Duration Single dose or 3 days
Notes Adjunct to ORS; reduces disease duration
5. Anthrax (Post-Exposure Prophylaxis)
Parameter Recommendation
Age Any age (including <8 years due to severity)
Dose 2.2 mg/kg twice daily (max 100 mg/dose)
Duration 60 days
Notes Life-saving indication overrides dental concerns

Secondary Paediatric Indications (Off-label)

Indication Age Dose Duration Notes
Mycoplasma pneumoniae pneumonia
≥8 years 2 mg/kg twice daily (max 100 mg/dose) 7–10 days OFF-LABEL; when macrolide-resistant suspected
Acne vulgaris (moderate–severe)
≥12 years 50–100 mg once daily 6–12 weeks OFF-LABEL; with topical therapy

Safety Monitoring in Paediatrics

  • Monitor for GI upset; administer with food if needed
  • Advise upright posture for 30 minutes post-dose
  • Sun protection during treatment
  • Dental surveillance if used in children <8 years
  • Document indication clearly when used off-label or in younger children
Renal Adjustments
No dose adjustment required for most patients.
Renal Function Recommendation
eGFR >30 mL/min No adjustment needed
eGFR 10–30 mL/min Standard dose acceptable for short courses; avoid prolonged therapy
eGFR <10 mL/min Use with caution; standard dose acceptable but monitor for accumulation
Haemodialysis Not significantly removed; no supplemental dose required
Peritoneal dialysis Not significantly removed; standard dosing
CRRT Standard dosing; monitor clinically
Clinical Note: Unlike other tetracyclines, doxycycline is primarily excreted via GI tract (chelated in intestines), making it safer in renal impairment.
Hepatic adjustment
Contraindications
  • Known hypersensitivity to doxycycline, any tetracycline, or excipients
  • Pregnancy (second and third trimesters) — absolute contraindication
  • Children <8 years — relative contraindication (except life-threatening infections under specialist care)
  • Concurrent use with systemic retinoids (isotretinoin, acitretin) — risk of benign intracranial hypertension
  • Myasthenia gravis — may exacerbate weakness (use only if no alternative and with close monitoring)

Cautions

  • Oesophageal injury: Administer with adequate water; maintain upright posture for 30 minutes; avoid bedtime dosing
  • Photosensitivity: Advise sun avoidance and protective measures
  • First trimester pregnancy: Use only if no safer alternative and benefit outweighs risk
  • Systemic lupus erythematosus: May exacerbate; use with caution
  • History of oral/oesophageal surgery or strictures
  • Concurrent hepatotoxic drugs
  • Prolonged use: Risk of superinfection (Candida, Clostridioides difficile)
  • Intracranial hypertension history

Pregnancy

Parameter Details
Risk Category
Contraindicated in 2nd and 3rd trimesters
Risk Summary Crosses placenta; causes permanent teeth discoloration (yellow-brown), enamel hypoplasia, and inhibition of bone growth in fetus
First Trimester Limited data; may be used if benefits clearly outweigh risks and no alternative exists
Preferred Alternatives Azithromycin (for chlamydia, atypicals), Amoxicillin (for respiratory infections), Penicillin (for syphilis), Ceftriaxone (for gonorrhoea)
When May Be Used Life-threatening maternal infection with no suitable alternative (e.g., rickettsial disease) — specialist decision
Monitoring If inadvertent exposure, counsel regarding risks; no specific fetal monitoring indicated
Lactation
Parameter Details
Compatibility
Generally compatible for short courses
Milk Levels Low; minimal excretion into breast milk
Infant Absorption Poorly absorbed by infant due to chelation with milk calcium
Preferred Alternatives Azithromycin (if appropriate for indication)
Infant Monitoring Observe for oral candidiasis, loose stools; theoretical dental staining risk with prolonged maternal use is very low
Recommendation Short courses (≤3 weeks) acceptable during breastfeeding; avoid prolonged therapy if possible
Elderly
Parameter Recommendation
Starting Dose Standard adult dosing (100 mg once or twice daily)
Titration Not applicable
Special Considerations Higher risk of oesophageal ulceration — ensure adequate hydration and upright posture; monitor for pill oesophagitis symptoms (dysphagia, odynophagia, retrosternal pain)
Renal Function No dose adjustment typically needed
Drug Interactions Review concurrent medications (antacids, iron, calcium supplements, anticoagulants)
Adverse Effects Monitor for Clostridioides difficile infection; may be more susceptible
Major drug interactions
Interacting Drug Effect Mechanism Recommendation
Isotretinoin / Acitretin
Risk of benign intracranial hypertension (pseudotumour cerebri) Additive effect on intracranial pressure
AVOID combination
Methotrexate
Increased methotrexate toxicity Decreased renal clearance; displaced protein binding
Avoid or use with extreme caution; monitor closely
Warfarin / Acenocoumarol
Enhanced anticoagulant effect; increased bleeding risk Altered gut flora reducing vitamin K synthesis; possible CYP inhibition
Monitor INR closely; may need warfarin dose reduction
Ciclosporin
Increased ciclosporin levels Unknown mechanism
Monitor ciclosporin levels
Antacids (Al/Mg/Ca-containing)
Markedly reduced doxycycline absorption Chelation in GI tract
Separate by at least 2–3 hours
Oral iron preparations
Reduced absorption of both drugs Mutual chelation
Separate by at least 2–3 hours
Calcium supplements / Dairy
Reduced doxycycline absorption Chelation
Separate by 2 hours; or take doxycycline with low-calcium meal
Sucralfate
Reduced doxycycline absorption Physical binding
Separate by at least 2 hours
Quinapril
Reduced quinapril absorption Contains magnesium carbonate excipient
Separate administration
Moderate drug interactions
Interacting Drug Effect Recommendation
Rifampicin
Reduced doxycycline levels (half-life reduced by ~50%) May need doxycycline 100 mg twice daily instead of once daily; monitor clinical response
Phenytoin / Carbamazepine / Phenobarbital
Reduced doxycycline efficacy Enzyme induction; consider higher doxycycline dose or twice daily dosing
Oral contraceptives
Theoretical reduced efficacy (controversial) Limited evidence; advise additional contraception during antibiotic course and 7 days after (as per standard practice)
Theophylline
Possible increased GI adverse effects Monitor for nausea, vomiting
Digoxin
Possible increased digoxin levels (in ~10% patients) Monitor digoxin levels if signs of toxicity
Penicillins
Possible antagonism (bacteriostatic vs bactericidal) Clinical significance uncertain; avoid in severe infections like endocarditis/meningitis if possible
Lithium
Possible increased lithium levels Monitor lithium levels
Kaolin-pectin antidiarrhoeals
Reduced doxycycline absorption Separate by 2 hours
Common Adverse effects
  • Nausea, vomiting
  • Epigastric discomfort, dyspepsia
  • Diarrhoea
  • Photosensitivity (phototoxic dermatitis)
  • Oesophageal irritation / ulceration
  • Vaginal candidiasis
  • Oral candidiasis (thrush)
  • Headache
  • Skin rash (non-serious)

Serious Adverse effects

Adverse Effect Clinical Notes
Benign intracranial hypertension (pseudotumour cerebri)
Headache, visual disturbances, papilloedema; discontinue immediately
Stevens-Johnson syndrome / Toxic epidermal necrolysis
Rare; discontinue immediately; hospitalisation required
Drug-induced hepatotoxicity
Monitor LFTs; discontinue if significant elevation
Clostridioides difficile colitis
May occur during or weeks after therapy; discontinue and treat appropriately
Severe photosensitivity / phototoxic bullous eruption
Discontinue; supportive care
Oesophageal ulceration / stricture
Odynophagia, retrosternal pain; prevention is key
Exacerbation of myasthenia gravis
Worsening weakness; avoid in known MG
Hypersensitivity reactions / Anaphylaxis
Rare; standard management
Permanent teeth discoloration
In children <8 years; enamel hypoplasia
Monitoring requirements
Timing Parameters
Baseline
LFTs if prolonged course planned (>2–3 weeks); renal function (for drug interaction assessment, not dose adjustment)
During Therapy
Clinical response; signs of oesophageal irritation; skin for photosensitivity; signs of superinfection
Long-term Use (>3 months)
LFTs every 2–3 months; monitor for C. difficile symptoms; periodic dental check in younger patients
If on Anticoagulants
INR within 3–5 days of starting and after stopping
Symptoms of Intracranial Hypertension
Immediate ophthalmological evaluation if headache, visual changes, papilloedema
Brands in India
Doxt Dr. Reddy's Capsules 100 mg
Doxycee Cipla Capsules 100 mg
Doxy-1 Micro Labs Capsules/Tablets 100 mg
Microdox Micro Labs Capsules 100 mg
Doxrid Ridley Life Sciences Capsules 100 mg
Biodoxi Biochem Capsules 100 mg
Tetradox Alkem Capsules 100 mg
Doxybond Mankind Capsules 100 mg
Doxiford Intas Capsules 100 mg

Fixed-Dose Combinations (Common)

Brand Name Combination Use
Doxt-SL Doxycycline + Lactobacillus GI protection
Price range (INR)
Formulation Approximate Price Notes
Capsules 100 mg (strip of 10) ₹50–120 Wide brand variation
Tablets 100 mg (strip of 10) ₹40–100
Injection 100 mg vial ₹80–200 Limited use
  • NLEM Status: Doxycycline is included in National List of Essential Medicines (NLEM) 2022
  • DPCO Price Control: Subject to price ceiling under DPCO
  • Government Supply: Available in public health facilities under national programmes (NVBDCP, RNTCP TB-HIV)

Clinical pearls

  1. First-line for scrub typhus — Critical to recognise rickettsial illness in endemic areas (Himalayan belt, NE India, South India); do not wait for serology to initiate treatment in clinically suspected cases
  2. Take upright with full glass of water — Most common preventable ADR is oesophageal ulceration; advise patients to remain upright 30 minutes post-dose and avoid bedtime administration
  3. Food minimally affects absorption — Unlike other tetracyclines, doxycycline can be given with food to reduce GI upset (except high-calcium meals/dairy)
  4. Photosensitivity counselling — Less photosensitive than other tetracyclines but still significant; advise sunscreen SPF 30+, protective clothing, avoidance of prolonged sun exposure
  5. Preferred tetracycline in renal impairment — Primary excretion via intestinal chelation, not kidneys; safe to use without dose adjustment in CKD
  6. STI syndromic management — For urethral/cervical discharge, combine with ceftriaxone 250 mg IM (single dose) to cover both gonorrhoea and chlamydia per NACO guidelines
  7. Acne duration — Limit oral antibiotic courses to 6–12 weeks; always combine with topical retinoid and benzoyl peroxide to reduce resistance emergence
Version
RxIndia v0.1 — 27 Jan 2025
Reference
    • CDSCO approved prescribing information for Doxycycline
    • Indian Pharmacopoeia 2022
    • NLEM India 2022
    • NCDC Treatment Modules — Scrub Typhus, Cholera, Plague
    • NVBDCP Guidelines — Malaria Chemoprophylaxis and Treatment
    • NACO STI/RTI Technical Guidelines 2014 (updated)
    • ICMR — Rickettsial Disease Guidelines
    • API Textbook of Medicine (11th Edition) — Rickettsial infections, Leptospirosis, Brucellosis
    • IAP Textbook of Pediatrics — Antimicrobial dosing
    • Goodman & Gilman's The Pharmacological Basis of Therapeutics (14th Edition)
    • Harrison's Principles of Internal Medicine (21st Edition)
    • BLISTER trial (off-label bullous pemphigoid reference)
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