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

Q: What can I use to replace pemirolast?

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)](https://www.goodrx.com/olopatadine/what-is) and [Zaditor (ketotifen)](https://www.goodrx.com/zaditor/what-is).

pemirolast

Used for Allergic Conjunctivitis

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

What is Pemirolast?

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

Drug facts

Common Brands	Alamast(brand no longer available)
Drug Class	Mast cell stabilizer
Controlled Substance Classification	Not a controlled medication
Generic Status	No lower-cost generic available
Availability	Discontinued

Common Brands

Alamast(brand no longer available)

Drug Class

Mast cell stabilizer

Controlled Substance Classification

Not a controlled medication

Generic Status

No lower-cost generic available

Availability

Discontinued

Common questions about Alamast

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

It's not fully clear why Alamast was discontinued.

If you've used Alamast 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).

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.