Skip to Content

Mixed grass pollens allergen extract Side Effects

For the Consumer

Applies to mixed grass pollens allergen extract: sublingual tablet

In addition to its needed effects, some unwanted effects may be caused by mixed grass pollens allergen extract. In the event that any of these side effects do occur, they may require medical attention.

Major Side Effects

You should check with your doctor immediately if any of these side effects occur when 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

Minor Side Effects

Some of the side effects that can occur with mixed grass pollens allergen extract may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

Less common:
  • Acid or sour stomach
  • belching
  • stomach discomfort, upset, or pain
Less common or rare:
  • Burning feeling in the chest or stomach
  • nausea or vomiting
Incidence not known:
  • Diarrhea
  • dry eyes
  • dry mouth

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.

Not all side effects for mixed grass pollens allergen extract may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.