Antirabies%25252525252525252525252525252525252525252525252520vaccine

# Antirabies vaccine ## Overview Rabies vaccines are inactivated virus vaccines used for pre-exposure prophylaxis (PrEP) and post-exposure prophylaxis (PEP) to prevent rabies infection. ## Primary Indications * **Pre-exposure prophylaxis (PrEP):** For individuals at high risk of exposure to rabies virus (e.g., veterinarians, laboratory workers, animal handlers, travelers to endemic areas). * **Post-exposure prophylaxis (PEP):** For individuals who have been bitten or have had significant contact with a potentially rabid animal. ## Adult Dosing * **PrEP:** * Intramuscular (IM): 1 mL on days 0, 7, and 21 (or 28). * Intradermal (ID): 0.1 mL on days 0, 7, and 21 (or 28) - *Availability and specific formulation may vary; consult local guidelines.* * **PEP (if the biting animal is available and can be observed/tested):** * Administered to unvaccinated individuals. * Rabies immune globulin (RIG): 20 IU/kg, infiltrated as much as possible into and around wounds, with any remainder given IM at a site distant from vaccine administration. * Vaccine: 1 mL IM on days 0, 3, 7, and 14. * **PEP (if the biting animal is unavailable, is suspect, or confirmed rabid):** * Administered to unvaccinated individuals. * RIG: 20 IU/kg, infiltrated as much as possible into and around wounds, with any remainder given IM at a site distant from vaccine administration. * Vaccine: 1 mL IM on days 0, 3, 7, 14, and 28. *Note: Specific PEP regimens can vary based on the type of exposure, the animal involved, and local public health recommendations. Consultation with public health authorities or infectious disease specialists is crucial.* ## Pediatric Dosing Pediatric dosing is generally based on weight, using the same volume (1 mL IM) and schedule as adults. * **PrEP:** 1 mL IM on days 0, 7, and 21 (or 28). * **PEP:** Similar to adults, with RIG dose based on weight (20 IU/kg). Vaccine is typically 1 mL IM per dose, following the appropriate PEP schedule (days 0, 3, 7, 14, and potentially day 28). ## Dose Adjustments No dose adjustments are needed for hepatic or renal impairment. ## Contraindications * Severe allergic reaction (anaphylaxis) to a previous dose of rabies vaccine or any component of the vaccine. * Severe acute illness (vaccination may be postponed until recovery). ## Adverse Effects Common: Pain, redness, swelling, itching at the injection site; headache, nausea, abdominal pain, muscle aches, dizziness. Less common: Urticaria, joint pain, fever, lymphadenopathy. Rare: Neurologic events (e.g., Guillain-Barré syndrome) have been rarely associated with rabies vaccines, particularly older formulations; however, benefits of vaccination outweigh risks, especially in PEP. ## Key Drug Interactions * **Immunosuppressive therapies:** May reduce the immune response to the vaccine. If possible, administer after immunosuppressive therapy has ended or consider higher PrEP doses or serologic testing. * **Other vaccines:** Can be administered concurrently or sequentially, but at different anatomical sites. ## Monitoring * For PrEP: Serologic testing (rabies virus neutralizing antibody titers) is recommended every 2 years for individuals at ongoing high risk to assess the need for booster doses. * For PEP: Monitor for signs of rabies infection in the exposed individual and the animal if applicable. Monitor for adverse reactions to the vaccine and RIG. ## Clinical Pearls * **RIG:** Should be administered at the time of the first vaccine dose whenever indicated for PEP. It is not administered to individuals who have previously received a complete course of rabies vaccine PrEP or PEP. * **PEP is critical:** Prompt and appropriate PEP can prevent rabies, which is nearly uniformly fatal once symptoms develop. * **Consultation:** Always consult local public health authorities or infectious disease specialists for guidance on PEP, especially in cases of potential rabies exposure. * **Types of Vaccines:** Different rabies vaccines exist (e.g., Human Diploid Cell Vaccine - HDCV, Purified Chick Embryo Cell Vaccine - PCECV, Vero Cell Rabies Vaccine - VRC). Dosing and regimens are generally consistent, but consult package inserts. *** *This information is intended for healthcare professionals. Please consult the most current prescribing information and local guidelines for definitive patient care decisions.*