📋 Clinical Overview

A sterile suspension of adsorbed, purified diphtheria, tetanus, and pertussis toxoids for active immunization. It is a triple antigen vaccine that stimulates the immune system to produce protective antibodies against diphtheria, tetanus, and pertussis (whooping cough). It is a critical component of the Universal Immunization Programme (UIP) in India for primary immunization in infants and children.

💊 Dosage & Administration

Adult: NOT RECOMMENDED for adults. For adults and children ≥7 years, Tdap (reduced diphtheria and pertussis antigen) is used.
Pediatric: 0.5 mL per dose, intramuscularly. Primary Series: Three doses at 6, 10, and 14 weeks of age (as per India's NIS). First Booster: One dose at 16-24 months (DPT booster). The interval between doses should be at least 4 weeks.
Renal Adjusment: No dosage adjustment required.
Hepatic Adjusment: No dosage adjustment required.
Instruction: Shake the vial/vial or pre-filled syringe well before use. Administer by deep intramuscular injection, preferably in the anterolateral aspect of the mid-thigh in infants or the deltoid muscle in older children. Do not administer intravenously, intradermally, or subcutaneously. Use a separate, sterile syringe and needle for each patient.

⚠️ Contraindications

History of severe allergic reaction (e.g., anaphylaxis) to a previous dose of DPT vaccine or any component (e.g., aluminum adjuvant, thimerosal if present as preservative).
Encephalopathy (e.g., coma, prolonged seizures) within 7 days of a prior pertussis-containing vaccine, not attributable to another identifiable cause.

🔬 Mechanism of Action

Contains formaldehyde-inactivated toxins (toxoids) from Corynebacterium diphtheriae, Clostridium tetani, and Bordetella pertussis. Upon intramuscular administration, the adsorbed toxoids are taken up by antigen-presenting cells, processed, and presented to helper T-cells. This stimulates B-lymphocytes to proliferate and differentiate into memory B-cells and antibody-producing plasma cells. The produced neutralizing antibodies (IgG) provide protection against the respective diseases.

🤕 Side Effects

Pain, redness, swelling, or induration at the injection site (very common, up to 50%).
Mild fever (<39°C / 102.2°F).
Fussiness, irritability, drowsiness.
Loss of appetite.

🤰 Special Populations

Pregnancy: CONTRANDICATED. This pediatric formulation (DPT) is not for use in pregnancy. Pregnant women should receive Tdap (reduced antigen) for passive protection of the newborn against pertussis, preferably during the 2nd or 3rd trimester.

Lactation: Compatible with breastfeeding. The vaccine is not contraindicated in lactating mothers, but DPT is not the standard vaccine for this group (Tdap is preferred).

Alcohol: No known interaction.

Driving: No effect. However, fever or malaise post-vaccination may temporarily impair ability.

🔄 Drug Interactions

Immunosuppressants (e.g., high-dose corticosteroids, chemotherapy, biologics): Diminished or suboptimal immune response to the vaccine. Major
Other Live Vaccines (e.g., Oral Polio, MMR, Varicella): No significant interaction. Can be administered simultaneously at different sites. If not given together, a 4-week interval is recommended for live vaccines. Moderate
Anticoagulants (e.g., Warfarin): Increased risk of bleeding or hematoma at injection site. Use fine needle and apply firm pressure. Moderate

🔁 Alternatives to QUADRACEL (Note: This is a DTaP-IPV combination, different pertussis antigen)

Same composition (Diphtheria Toxoid (2520LF) + Tetanus Toxoid (57.5LF) + Pertussis Toxoid (1520IU)), different brands:

TETAVAX-DP TRIPTAX DIPHTHERIA TETANUS PERTUSSIS VACCINE (Adsorbed)