Rabies Vaccine Dose Per Injection
Each dose of rabies vaccine contains 1.0 mL administered intramuscularly, regardless of age, weight, or whether it's for pre-exposure or post-exposure prophylaxis. 1, 2
Dosing Details
The standard dose is consistently 1.0 mL per injection for all FDA-approved rabies vaccines (HDCV and PCECV) used in the United States. This volume-based dosing applies universally:
- Adults and older children: 1.0 mL IM in the deltoid muscle
- Infants and small children: 1.0 mL IM in the anterolateral thigh
- All age groups receive the same volume - there is no weight-based adjustment for the vaccine itself 1, 2
Important Clarification: International Units vs. Volume
The question asks about "units" of vaccine, but rabies vaccine dosing in the U.S. is specified by volume (mL), not international units (IU). International units are used only for rabies immune globulin (RIG), which is dosed at 20 IU/kg body weight 1, 3.
Post-Exposure Prophylaxis Schedules
Previously Unvaccinated Persons:
- 4-dose regimen (current ACIP recommendation): 1.0 mL IM on days 0,3,7, and 14 1
- 5-dose regimen for immunosuppressed: 1.0 mL IM on days 0,3,7,14, and 28 1, 2
- Plus RIG 20 IU/kg on day 0
Previously Vaccinated Persons:
- 2-dose regimen: 1.0 mL IM on days 0 and 3 1
- No RIG needed
Pre-Exposure Prophylaxis:
- 3-dose series: 1.0 mL IM on days 0,7, and 21 or 28 2
Critical Administration Points
Never administer in the gluteal area - this results in significantly lower neutralizing antibody titers and has been associated with vaccine failures 1, 3, 2. The deltoid (adults) or anterolateral thigh (young children) are the only acceptable sites.
The vaccine should never be mixed with RIG in the same syringe or administered at the same anatomic site as the first vaccine dose, though subsequent vaccine doses can be given at the same location where RIG was administered 1, 3.