Pemirolast is an eye drop that belongs to a group of medications known as [mast cell stabilizers](https://www.goodrx.com/classes/mast-cell-stabilizers). It works by blocking [mast cells](https://www.aaaai.org/conditions-treatments/related-conditions/mcas), or allergy cells, in your body from causing allergic reactions and inflammation (swelling). It can take anywhere between a few days and up to 1 month to lower eye itchiness.

Is pemirolast still available?

No. Pemirolast is [no longer available](https://www.accessdata.fda.gov/scripts/cder/daf/index.cfm?event=overview.process&ApplNo=021079) as a brand or generic medication in the United States.

Why was pemirolast discontinued?

It's not fully clear why pemirolast was [discontinued](https://www.accessdata.fda.gov/scripts/cder/daf/index.cfm?event=overview.process&ApplNo=021079).

Alamast

pemirolast

Used for Allergic Conjunctivitis

Basics FAQs Dosage Interactions Latest news Prices Medicare

Pemirolast prevents itching in your eyes caused by allergies. It's an eye drop that's no longer available because it was discontinued in the United States.

Reviewed by:

Shifali Patel, PharmD

Kristianne Hannemann, PharmD

Last reviewed on January 25, 2022

Basics FAQs Dosage Interactions Latest news Prices Medicare

What is Pemirolast?

Are you looking for information on Otezla (apremilast) instead?

Drug facts

Common BrandsAlamast(brand no longer available)

Drug ClassMast cell stabilizer

Controlled Substance ClassificationNot a controlled medication

Generic StatusNo lower-cost generic available

AvailabilityDiscontinued

Common questions about Pemirolast

Pemirolast is an eye drop that belongs to a group of medications known as mast cell stabilizers. It works by blocking mast cells, or allergy cells, in your body from causing allergic reactions and inflammation (swelling). It can take anywhere between a few days and up to 1 month to lower eye itchiness.

No. Pemirolast is no longer available as a brand or generic medication in the United States.

It's not fully clear why pemirolast was discontinued.

If you've used pemirolast in the past and need an eye drop to help with the itchiness, discuss other available treatment options with your healthcare provider. Depending on the nature of your eye condition and your past medical history, your provider will help guide you to a medication that's safe for you. Examples of other allergy eye drops include olopatadine (Pataday) and Zaditor (ketotifen).

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Pemirolast dosage

Typical dosage for Pemirolast

Interactions between Pemirolast and other drugs

Pemirolast may interact with certain medications or supplements. Always let your doctor and pharmacist know about any other medications or supplements (including prescribed and over-the-counter medications, vitamins, and dietary or herbal supplements) that you are currently taking. The list below does not include all possible drug interactions with Pemirolast. Please note that only the generic name of each medication is listed below.

Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. Tell your healthcare professional if you are taking any other prescription or nonprescription (over-the-counter [OTC]) medicine.