Carbachol
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| Trade names | Miostat |
| AHFS/Drugs.com | Monograph |
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By mouth (tablets) Solution for injection Topical (ophthalmic solution) |
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| Pharmacokinetic data | |
| Bioavailability | Low |
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| ECHA InfoCard | 100.000.117 |
| Chemical and physical data | |
| Formula | C6H15ClN2O2 |
| Molar mass | 182.696 g/mol |
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Carbachol (Carbastat, Carboptic, Isopto Carbachol, Miostat), also known as carbamylcholine, is a cholinomimetic drug that binds and activates the acetylcholine receptor. Thus it is classified as a cholinergic agonist. It is primarily used for various ophthalmic purposes, such as for treating glaucoma, or for use during ophthalmic surgery. It is generally administered as an ophthalmic solution (i.e. eye drops).
Carbachol produces effects comparable to those of V-series nerve agents if a massive overdose is administered (as may occur following industrial and shipping accidents) and therefore constitutes a risk to human health. It is classified as an extremely hazardous substance in the United States as defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act (42 U.S.C. 11002), and is subject to strict reporting requirements by facilities which produce, store, or use it in significant quantities.
Carbachol is a choline carbamate and a positively charged quaternary ammonium compound. It is not well absorbed in the gastro-intestinal tract and does not cross the blood–brain barrier. It is usually administered topical ocular or through intraocular injection. Carbachol is not easily metabolized by cholinesterase, it has a 2 to 5 minute onset of action and its duration of action is 4 to 8 hours with topical administration and 24 hours for intraocular administration. Since carbachol is poorly absorbed through topical administration, benzalkonium chloride is mixed in to promote absorption.
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Wikipedia