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Pemirolast ophthalmic Side Effects

For the Consumer

Applies to pemirolast ophthalmic: ophthalmic solution

As well as its needed effects, pemirolast ophthalmic may cause unwanted side effects that require medical attention.

Severity: Moderate

If any of the following side effects occur while taking pemirolast ophthalmic, check with your doctor or nurse as soon as possible:

Less common:
  • Cough (mucus-producing)
  • headache (severe)
  • stomach pain and cramping
  • pain and tenderness around eyes and cheekbones
  • painful menstrual bleeding
  • runny or stuffy nose
  • tightness in chest
  • troubled breathing

Minor Side Effects

Some pemirolast ophthalmic side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned about them:

More common:
  • Chills
  • cough
  • fever
  • sneezing
  • sore throat
Less common:
  • Back pain
  • burning feeling in eye
  • eyelid swelling
  • eye dryness
  • foreign body feeling in eye
  • general feeling of eye discomfort
  • increased itching of the eye
  • redness of the eye

For Healthcare Professionals

Applies to pemirolast ophthalmic: ophthalmic solution


Respiratory side effects have included rhinitis and cold or flu symptoms in 10% to 25% of patients. Less common side effects that have occurred in less than 5% of patients have included bronchitis, cough, sinusitis, sneezing, and nasal congestion.[Ref]

Nervous system

Nervous system side effects have included headache in 10% to 25% of patients.[Ref]


Ocular side effects have included burning, dry eye, foreign body sensation, and ocular discomfort in less than 5% of patients.[Ref]


Hypersensitivity reactions have been reported in less than 5% of patients.[Ref]


Genitourinary side effects have included dysmenorrhea (less than 5%).[Ref]


Musculoskeletal side effects have included backache in less than 5% of patients.[Ref]


1. "Product Information. Alamast (pemirolast ophthalmic)" Santen Inc, Napa, CA.

It is possible that some side effects of pemirolast ophthalmic may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.

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.