Product image of Miostat (Carbachol) supplied by GNH India

Miostat

Active Ingredient:
Carbachol
Origin:
EU

Miostat (Carbachol)

Carbachol, the active ingredient in Miostat, is a muscarinic agonist presented as a sterile ophthalmic solution for intraocular use. It is employed to lower intra‑ocular pressure and to induce pupil constriction during eye procedures, benefiting patients with glaucoma or requiring surgical miosis.

GNH India supplies Miostat as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide.

Manufacturer / TM Owner

Alcon Nv

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Indications & Clinical Uses

Carbachol acts as a miotic agent within the ocular pressure regulation pathway. It is indicated for:

  • Glaucoma (open‑angle and acute angle‑closure): reduces intra‑ocular pressure by enhancing aqueous humor outflow.
  • Induction of miosis during ophthalmic surgery: produces rapid pupil constriction to improve surgical access.
  • Ocular hypertension: lowers intra‑ocular pressure to prevent progression to glaucoma.

How It Works

  • Carbachol directly activates muscarinic (M3) receptors on the sphincter pupillae muscle and trabecular meshwork in the eye. This stimulation causes contraction of the pupil and increases outflow of aqueous humor through the trabecular pathway, resulting in lowered intra‑ocular pressure.

Side Effects

Carbachol may cause ocular and systemic reactions following intraocular administration.

Common Side Effects

  • Transient blurred vision: temporary loss of visual clarity.
  • Eye pain or discomfort: mild irritation after instillation.
  • Conjunctival redness: mild hyperemia of the eye.
  • Increased lacrimation: excess tearing.
  • Headache: mild to moderate.
  • Brow ache: localized discomfort.

Serious or Rare Side Effects

  • Severe ocular inflammation: uveitis or iritis requiring medical attention.
  • Allergic reaction: swelling, rash, or anaphylaxis.
  • Systemic cholinergic effects: bradycardia, hypotension, or bronchospasm.
  • Persistent miosis: prolonged pupil constriction affecting vision.
  • Corneal edema: swelling of the cornea.
  • Vision loss: rare but serious loss of visual acuity.

Precautions & Warnings

When using Carbachol, clinicians should observe several safety measures.

  • Assess intra‑ocular pressure before initiation: ensure baseline measurement.
  • Avoid in narrow‑angle glaucoma: risk of acute angle closure.
  • Caution in patients with asthma or COPD: potential bronchospasm.
  • Monitor for systemic cholinergic signs: bradycardia, hypotension.
  • Pregnancy and breastfeeding safety unknown: use only if benefit outweighs risk.
  • Store at room temperature: keep in original container, protect from light and moisture.

Avoid Interactions

Carbachol can interact with other medications that affect muscarinic pathways.

Major Interactions (Avoid)

  • Antimuscarinic agents (e.g., atropine, scopolamine): antagonize Carbachol’s ocular effect.
  • Systemic cholinesterase inhibitors (e.g., pyridostigmine): may potentiate cholinergic activity and increase systemic side effects.

Moderate Interactions (Monitor Closely)

  • Other miotic agents (e.g., pilocarpine): additive pupil constriction.
  • Topical non‑steroidal anti‑inflammatory drugs: may increase ocular irritation.
  • Systemic antihistamines: could reduce efficacy of pupil constriction.

Frequently Asked Questions

Miostat contains carbachol, a muscarinic agonist used primarily to lower intra‑ocular pressure in glaucoma and to induce pupil constriction (miosis) during ophthalmic surgery. It helps manage open‑angle and acute angle‑closure glaucoma and facilitates surgical access by shrinking the pupil.

Carbachol directly stimulates muscarinic M3 receptors on the sphincter pupillae muscle and trabecular meshwork. This causes the pupil to contract and increases aqueous humor outflow through the trabecular pathway, thereby reducing intra‑ocular pressure.

The specific dose and administration schedule for Miostat are determined by the prescribing ophthalmologist based on the patient’s condition, severity of glaucoma, and surgical requirements. Dosage instructions are individualized and should follow the prescriber’s guidance.

Safety data for carbachol in pregnancy and lactation are limited. It should only be used if the potential benefit justifies any possible risk to the fetus or infant. Physicians should discuss individual circumstances with the patient before prescribing.

To request Miostat, submit an enquiry on the product page at gnhindia.com, specifying the required quantity. GNH India supplies hospitals, pharmacies and procurement teams worldwide, and will verify trade or institutional credentials before providing pricing, availability, shipping details and any necessary import documentation.

Miostat (carbachol) is a direct muscarinic agonist, offering rapid onset of pupil constriction and intra‑ocular pressure reduction. Compared with pilocarpine, another miotic, carbachol often provides a more predictable response and may be preferred in acute angle‑closure situations, though choice depends on clinical judgment.

Miostat should be stored at room temperature, below 25 °C, in its original packaging. Keep the container tightly closed, protect it from light and moisture, and avoid freezing. Follow any additional handling instructions provided with the product.

Miostat is administered as an intraocular (ophthalmic) solution. The prescriber will instill the appropriate number of drops directly into the eye, typically under sterile conditions, either before surgery or as part of glaucoma management.

Serious risks include severe ocular inflammation, allergic reactions, systemic cholinergic effects such as bradycardia or hypotension, persistent miosis that impairs vision, corneal edema, and rare vision loss. Patients should be monitored closely for these events.

Miostat is contraindicated in patients with narrow‑angle glaucoma, known hypersensitivity to carbachol or any formulation component, and those with uncontrolled asthma or severe COPD where cholinergic stimulation could worsen bronchospasm. It should also be used with caution in pregnant or breastfeeding women.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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