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Alamast Side Effects

Generic Name: pemirolast ophthalmic

Note: This document contains side effect information about pemirolast ophthalmic. Some of the dosage forms listed on this page may not apply to the brand name Alamast.

For the Consumer

Applies to pemirolast ophthalmic: ophthalmic solution

Along with its needed effects, pemirolast ophthalmic (the active ingredient contained in Alamast) 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 as soon as possible if any of the following side effects occur while taking pemirolast ophthalmic:

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

Some side effects of pemirolast ophthalmic 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 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.

Some side effects of Alamast may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.

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.