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Mixed grass pollens allergen extract Side Effects

For the Consumer

Applies to mixed grass pollens allergen extract: sublingual tablet

Along with its needed effects, mixed grass pollens allergen extract 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 mixed grass pollens allergen extract:

More Common

  • Congestion
  • cough
  • difficulty with breathing
  • fever
  • itching ears, mouth, and tongue
  • noisy breathing
  • sore throat
  • swelling of the mouth
  • swollen glands
  • tightness in the chest

Less Common

  • Body aches or pain
  • chills
  • headache
  • hives or welts, itching, or skin rash
  • loss of voice
  • numbness or tingling feeling around the mouth
  • redness of the skin
  • runny nose or sneezing
  • swelling of the lips or tongue
  • unusual tiredness or weakness

Incidence Not Known

  • Difficulty swallowing
  • dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  • fast, irregular, pounding, or racing heartbeat or pulse
  • large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
  • puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
  • redness of the face, neck, arms, and occasionally, upper chest
  • sweating
  • swollen, painful, or tender lymph glands in the neck, armpit, or groin

Some side effects of mixed grass pollens allergen extract 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:

Less Common

  • Acid or sour stomach
  • belching
  • stomach discomfort, upset, or pain

Less Common or Rare

Incidence Not Known

For Healthcare Professionals

Applies to mixed grass pollens allergen extract: sublingual tablet


The most common side effects reported were oral pruritus, throat irritation, ear pruritus, mouth edema, tongue pruritus, cough, oropharyngeal pain.[Ref]


Postmarketing reports: Anaphylactic reaction, oral allergy syndrome, angioedema[Ref]


Very common (10% or more): Throat irritation (22%)

Common (1% to 10%): Cough, oropharyngeal pain, pharyngeal edema, tonsillitis, upper respiratory tract infection, asthma, dysphonia

Postmarketing reports: Dyspnea, laryngeal edema, stridor, wheezing, exacerbation of asthma, oropharyngeal blistering[Ref]


Postmarketing reports: Flushing, eosinophilic myocarditis, palpitations, tachycardia, hypotension, circulatory collapse, pallor, peripheral vascular disorder, chest discomfort[Ref]


Common (1% to 10%): Urticaria, atopic dermatitis

Postmarketing reports: Rash, pruritus[Ref]


Postmarketing reports: Autoimmune thyroiditis[Ref]


Very common (10% or more): Oral pruritus (25.1%)

Common (1% to 10%): Mouth edema, tongue pruritus, lip edema, oral paresthesia, abdominal pain, dyspepsia, tongue edema, oral hypoesthesia, stomatitis, dysphagia, nausea, vomiting, esophageal pain, gastritis, gastroesophageal reflux, lip pruritus

Postmarketing reports: Diarrhea, eosinophilic esophagitis, salivary gland enlargement and/or hypersecretion, dry mouth, dry eye[Ref]


Postmarketing reports: Lymphoadenopathy, increased eosinophilic count[Ref]


Postmarketing reports: Decreased weight[Ref]

Nervous system

Postmarketing reports: Loss of consciousness, headache, somnolence, dizziness[Ref]


Common (1% to 10%): Ear pruritus

Postmarketing reports: Malaise, face edema, tinnitus, asthenia, influenza-like illness[Ref]


Postmarketing reports: Anxiety[Ref]


1. "Product Information. Oralair (mixed grass pollens allergen extract)." Greer Laboratories Inc, Lenoir, NC.

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.