What is the correct dosage and route for adult rabies vaccine (ARV) after a potentially rabid dog bite?

Rabies Vaccine Dosing for Adults After Dog Bite

For previously unvaccinated adults after a potentially rabid dog bite, administer rabies vaccine 1.0 mL intramuscularly in the deltoid on days 0,3,7, and 14, plus rabies immune globulin (RIG) 20 IU/kg on day 0. 1

Critical Clarification: IV vs IM Route

Rabies vaccine is NEVER given intravenously (IV)—it must be administered intramuscularly (IM) in the deltoid muscle. The gluteal area should be avoided as it results in diminished immunologic response. 1, 2

Complete Post-Exposure Prophylaxis Protocol

For Previously Unvaccinated Adults:

Wound Management (Immediate)

• Thoroughly cleanse all wounds with soap and water for 15 minutes
• Irrigate with povidone-iodine solution if available 1

Rabies Immune Globulin (Day 0)

• Dose: 20 IU/kg body weight
• Infiltrate the full dose around and into the wound(s) if anatomically feasible
• Administer any remaining volume IM at a site distant from vaccine administration
• Never administer RIG in the same syringe or same anatomic site as the vaccine 1, 2
• RIG can be given up to day 7 if not administered on day 0 1

Rabies Vaccine Schedule

• 1.0 mL IM (deltoid) on days 0,3,7, and 14 1, 2
• This is the current ACIP-recommended 4-dose regimen (reduced from the previous 5-dose schedule)
• Day 0 = day of first vaccine dose

For Previously Vaccinated Adults:

Simplified Regimen:

• 1.0 mL IM (deltoid) on days 0 and 3 only 1
• No RIG required 1
• This applies to anyone with documented prior rabies vaccination series or documented adequate antibody response

Special Populations:

Immunosuppressed Patients:

• Use 5-dose schedule: days 0,3,7,14, and 28 1
• This is the only exception requiring the extended regimen

Key Clinical Pitfalls to Avoid

1. Never use IV route—this is a critical error that could result in treatment failure
2. Never inject in gluteal area—subcutaneous fat interferes with immune response 2
3. Never exceed recommended RIG dose—excess RIG may suppress active antibody production 1
4. Never delay treatment—begin immediately after exposure regardless of time interval 1
5. Never give RIG to previously vaccinated patients—it may inhibit the anamnestic response 1

Evidence Strength

The 4-dose regimen is supported by high-quality guideline evidence from ACIP (2010) and FDA drug labeling 1, 2. This reduced schedule (from 5 doses) has been validated through clinical trials showing adequate antibody response in all recipients when combined with RIG 3, 4. The regimen has proven 100% effective in preventing rabies when administered properly—no failures have been documented among 511 persons bitten by proven rabid animals who received this treatment 2.