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Generic name: carbachol ophthalmicKAR-ba-kall ]
Brand names: Isopto Carbachol, Miostat
Drug class: Ophthalmic glaucoma agents

Medically reviewed by on Feb 21, 2024. Written by Cerner Multum.

What is Miostat?

Carbachol lowers pressure in the eye by increasing the amount of fluid that drains from the eye.

Miostat (for the eye) is used to reduce pressure inside the eye after cataract surgery.

Miostat may also be used for purposes not listed in this medication guide.

Miostat side effects

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Miostat may cause serious side effects. Call your doctor at once if you have:

Common side effects of Miostat may include:

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


Before you are treated with Miostat, tell your doctor about all your medical conditions or allergies, and all the medicines you are using. Also make sure your doctor knows if you are pregnant or breast-feeding. In some cases, you may not be able to use this medicine, or you may need a dose adjustment or special precautions.

Before taking this medicine

You should not be treated with Miostat if you are allergic to it.

To make sure Miostat is safe for you, tell your doctor if you have any of these other conditions:

It is not known whether Miostat will harm an unborn baby. Tell your doctor if you are pregnant.

It is not known whether carbachol ophthalmic passes into breast milk or if it could harm a nursing baby. Tell your doctor if you are breast-feeding a baby.

How should I use Miostat?

Miostat is given as an injection into your eye. Your doctor will use a medicine to numb your eye before giving you the injection. You will receive this injection in your doctor's office or other clinic setting.

What happens if I miss a dose?

Since Miostat is given by a healthcare professional during surgery, it does not have a daily dosing schedule.

What happens if I overdose?

Since Miostat is given by a healthcare professional in a medical setting, an overdose is unlikely to occur.

What should I avoid after receiving Miostat?

This medicine may cause blurred vision and may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert and able to see clearly.

What other drugs will affect Miostat?

It is not likely that other drugs you take orally or inject will have an effect on carbachol used in the eyes. But many drugs can interact with each other. Tell each of your healthcare providers about all medicines you use, including prescription and over-the-counter medicines, vitamins, and herbal products.

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.