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Peanut allergen powder Side Effects

Medically reviewed by Last updated on Nov 28, 2022.

Applies to peanut allergen powder: oral capsule, oral powder.


Oral route (Capsule; Powder)

Peanut (Arachis hypogaea) Allergen Powder-dnfp can cause anaphylaxis, which may be life-threatening and can occur at any time during. Prescribe injectable epinephrine, instruct and train patients on its appropriate use, and instruct patients to seek immediate medical care upon its use. Do not administer Peanut (Arachis hypogaea) Allergen Powder-dnfp to patients with uncontrolled asthma. Dose modifications may be necessary following an anaphylactic reaction. Observe patients during and after administration of the Initial Dose Escalation and the first dose of each Up-Dosing level, for at least 60 minutes. Because of the risk of anaphylaxis, Peanut (Arachis hypogaea) Allergen Powder-dnfp is available only through a restricted program under a Risk Evaluation and Mitigation Strategy (REMS) called the Palforzia REMS.

Serious side effects

Along with its needed effects, peanut allergen powder may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking peanut allergen powder:

More common

  • Chest tightness
  • cough
  • difficulty swallowing
  • dizziness
  • fast heartbeat
  • hives, itching, skin rash
  • nausea
  • puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
  • stomach pain
  • throat irritation and tightness
  • trouble breathing
  • unusual tiredness or weakness
  • vomiting

Other side effects

Some side effects of peanut allergen powder may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

For Healthcare Professionals

Applies to peanut allergen powder: oral capsule, oral powder.


Common (1% to 10%): Anaphylactic reaction[Ref]


Very common (10% or more): Throat irritation (40.3%), cough (31.9%), rhinorrhea (20.9%), sneezing (20.2%), throat tightness (14.1%), wheezing (12.3%)

Common (1% to 10%): Dyspnea[Ref]


Very common (10% or more): Abdominal pain (67.1%), vomiting (36.5%), nausea (32.3%), oral paresthesia (13.6%)[Ref]


Common (1% to 10%): Ear pruritus[Ref]


Very common (10% or more): Pruritus (32.5%), urticaria (28.4%)[Ref]


1. "Product Information. Palforzia (peanut allergen extract)." Aimmune Therapeutics (2020):

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.