Medication Guide App

Isopto Carbachol Side Effects

Generic Name: carbachol ophthalmic

Note: This page contains information about the side effects of carbachol ophthalmic. Some of the dosage forms included on this document may not apply to the brand name Isopto Carbachol.

Not all side effects for Isopto Carbachol may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

For the Consumer

Applies to carbachol ophthalmic: ophthalmic solution

In addition to its needed effects, some unwanted effects may be caused by carbachol ophthalmic (the active ingredient contained in Isopto Carbachol). In the event that any of these side effects do occur, they may require medical attention.

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

  • Veil or curtain appearing across part of vision
Symptoms of too much medicine being absorbed into the body
  • Diarrhea, stomach cramps or pain, or vomiting
  • fainting
  • flushing or redness of face
  • frequent urge to urinate
  • increased sweating
  • irregular heartbeat
  • shortness of breath, wheezing, or tightness in chest
  • unusual tiredness or weakness
  • watering of mouth

Some of the side effects that can occur with carbachol ophthalmic may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

More common
  • Blurred vision or change in near or distance vision
  • eye pain
  • stinging or burning of the eye
Less common
  • Headache
  • irritation or redness of eyes
  • twitching of eyelids

For Healthcare Professionals

Applies to carbachol ophthalmic: compounding powder, intraocular solution, ophthalmic solution


Cardiovascular side effects have included cardiac arrhythmia and hypotension.[Ref]


Gastrointestinal side effects have included epigastric distress, abdominal cramps, diarrhea, and vomiting.[Ref]


Ocular side effects of carbachol injection have included corneal clouding, persistent bullous keratopathy, retinal detachment, and postoperative iritis following cataract extraction. Ocular side effects of carbachol drops have included transient stringing and burning, irritation of the eyes, temporary decrease in visual acuity due to ciliary spasm, and transient ciliary and conjunctival injection.[Ref]


Respiratory side effects have included exacerbation of bronchial asthma.[Ref]

Nervous system

Nervous system side effects have included flushing, sweating, headache, syncope, and salivation.[Ref]


Genitourinary side effects have included tightness in the urinary bladder and frequent urge to urinate.[Ref]


1. "Product Information. Miostat (carbachol ophthalmic)." Alcon Laboratories Inc, Fort Worth, TX.

2. "Product Information. Isopto Carbachol (carbachol ophthalmic)." Alcon Laboratories Inc, Fort Worth, TX.

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