RabAvert Side Effects: What to Expect and When to Call Your Doctor

Like all vaccines, RabAvert can cause side effects. The good news is that the vast majority of people who receive RabAvert experience only mild, temporary reactions — and serious side effects are rare. Understanding what to expect after each dose can help you distinguish normal vaccine reactions from symptoms that warrant medical attention.

Common Side Effects of RabAvert (Expected and Temporary)

The most frequently reported side effects of RabAvert in clinical trials were mild to moderate and resolved on their own. Based on clinical trial data, here's what you're most likely to experience:

Injection Site Reactions

• Pain at the injection site — occurs in 84% of patients in clinical trials
• Redness (erythema) at the injection site
• Swelling or hardening (induration) at the injection site

These reactions are very common and typically resolve within 1–2 days. Applying a cold compress to the injection site can help reduce discomfort.

Systemic (Body-Wide) Side Effects

• Headache — reported in up to 52% of patients in clinical trials
• Muscle pain (myalgia) — up to 53% of patients
• Fatigue and malaise — reported in about 20% of patients
• Low-grade fever
• Dizziness — approximately 15% of patients
• Nausea or stomach upset
• Joint pain
• Swollen lymph nodes
• Skin rash

These flu-like symptoms are a normal sign that your immune system is responding to the vaccine. They typically appear within 1–3 days of injection and resolve within a few days. Over-the-counter pain relievers (like acetaminophen) can help manage discomfort — consult your doctor before use.

Serious Side Effects: When to Seek Immediate Medical Attention

Serious side effects from RabAvert are rare, but they do occur. Seek emergency medical care immediately if you experience any of the following after receiving RabAvert:

• Signs of anaphylaxis (severe allergic reaction): hives, difficulty breathing, swelling of the face/lips/throat, rapid heartbeat, dizziness, or loss of consciousness. This can occur within minutes to hours of vaccination.
• Neurological symptoms: numbness or tingling in arms or legs, muscle weakness, difficulty walking, vision changes, or confusion. These may indicate rare vaccine-related neurological reactions.
• Severe headache or neck stiffness — may indicate encephalitis (brain inflammation), an extremely rare but serious complication
• High fever (over 103°F / 39.4°C) combined with other symptoms

Very Rare Serious Adverse Events

The following serious adverse events have been reported with RabAvert, though they are very rare:

• Encephalitis (inflammation of the brain) — rare; has been reported in very rare cases
• Guillain-Barré Syndrome (GBS) — an immune-mediated nerve condition causing progressive muscle weakness; rare
• Transverse myelitis (inflammation of the spinal cord) — rare
• Optic neuritis (inflammation of the optic nerve, affecting vision) — rare

Important context: these serious events are extraordinarily rare. The risk of these complications is vastly outweighed by the risk of rabies itself — an almost universally fatal disease once symptoms appear.

Special Populations: Pregnancy, Breastfeeding, and Immunocompromised Patients

RabAvert has not been studied in pregnant or breastfeeding women. However, because rabies is almost invariably fatal, post-exposure prophylaxis during pregnancy is not contraindicated — the benefit of vaccination far outweighs any potential risk. For pre-exposure vaccination during pregnancy, discuss with your doctor whether vaccination can wait.

Immunocompromised patients (those on corticosteroids, chemotherapy, biologic agents, or radiation therapy) may have a reduced antibody response to RabAvert. After completing a PEP or PrEP series, serologic testing is recommended to confirm adequate immune response (≥0.5 IU/mL by RFFIT).

Managing Common Side Effects at Home

• Injection site pain: Apply a cool, damp cloth to the area. Avoid pressing on the injection site.
• Fever and body aches: Acetaminophen (Tylenol) or ibuprofen (Advil) can help — consult your doctor or pharmacist for appropriate dosing.
• Dizziness: Rest after the injection. Avoid driving for a few hours if you experience significant dizziness.
• Nausea: Eat a light meal before vaccination and stay hydrated.

For information on medications that can affect how well RabAvert works, see: RabAvert Drug Interactions: What to Avoid and What to Tell Your Doctor.

Need help finding a location for your follow-up doses? Use medfinder to find RabAvert in stock near you.