Homatropine

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Homatropine

Systematic (IUPAC) name
(N-methyl-8-azabicyclo[3.2.1]oct-3-yl) 2-hydroxy-2-phenylacetate
Clinical data
AHFS/Drugs.com	monograph
MedlinePlus	a601006
Legal status	?
Identifiers
CAS number	87-00-3^N
ATC code	A02BX03 S01FA05
PubChem	CID 6321423
DrugBank	DB00725
ChemSpider	16498795^Y
UNII	8QS6WCL55Z^Y
ChEMBL	CHEMBL1233442^N
Chemical data
Formula	C₁₆H₂₁N O₃
Mol. mass	356.26 g/mol
SMILES CN3[C@H]1CC[C@@H]3C[C@@H](C1)OC(=O)C(O)c2ccccc2
InChI InChI=1S/C16H21NO3/c1-17-12-7-8-13(17)10-14(9-12)20-16(19)15(18)11-5-3-2-4-6-11/h2-6,12-15,18H,7-10H2,1H3/t12-,13+,14+,15?^Y Key:ZTVIKZXZYLEVOL-MCOXGKPRSA-N^Y
N (what is this?) (verify)

Homatropine (Equipin, Isopto Homatropine) is an anticholinergic medication that is an antagonist at muscarinic acetylcholine receptors and thus the parasympathetic nervous system. It is used in eye drops as a cycloplegic (to temporarily paralyze accommodation), and as a mydriatic (to dilate the pupil). For Homatropine methylbromide see Methylhomatropine, this is a different medication. Homatropine is less potent than atropine and has a shorter duration of action. It is available as the hydrobromide salt.

Homatropine is also given as an atropine substitute given to reverse the muscarinic and CNS effects associated with indirect cholinomimetic (anti-AChase) administration.

Side effects

Blurred vision
Sensitivity to light

Complications

Untreated glaucoma
Myasthenia gravis
Severe heart failure
Thyrotoxicosis

References

Ophthalmologicals: mydriatics and cycloplegics (S01F)

Anticholinergics/antimuscarinics

Sympathomimetics

M: EYE

anat (g/a/p)/phys/devp/prot

noco/cong/tumr, epon

proc, drug (S1A/1E/1F/1L)

Cholinergics

Receptor ligands

mAChR	Agonists: 77-LH-28-1 AC-42 AC-260,584 Aceclidine Acetylcholine AF30 AF150(S) AF267B AFDX-384 Alvameline AQRA-741 Arecoline Bethanechol Butyrylcholine Carbachol CDD-0034 CDD-0078 CDD-0097 CDD-0098 CDD-0102 Cevimeline Choline cis-Dioxolane Ethoxysebacylcholine LY-593,039 L-689,660 LY-2,033,298 McNA343 Methacholine Milameline Muscarine NGX-267 Ocvimeline Oxotremorine PD-151,832 Pilocarpine RS86 Sabcomeline SDZ 210-086 Sebacylcholine Suberylcholine Talsaclidine Tazomeline Thiopilocarpine Vedaclidine VU-0029767 VU-0090157 VU-0152099 VU-0152100 VU-0238429 WAY-132,983 Xanomeline YM-796 Antagonists: 3-Quinuclidinyl Benzilate 4-DAMP Aclidinium Bromide Anisodamine Anisodine Atropine Atropine Methonitrate Benactyzine Benzatropine/Benztropine Benzydamine BIBN 99 Biperiden Bornaprine CAR-226,086 CAR-301,060 CAR-302,196 CAR-302,282 CAR-302,368 CAR-302,537 CAR-302,668 CS-27349 Cyclobenzaprine Cyclopentolate Darifenacin DAU-5884 Dimethindene Dexetimide DIBD Dicyclomine/Dicycloverine Ditran EA-3167 EA-3443 EA-3580 EA-3834 Etanautine Etybenzatropine/Ethylbenztropine Flavoxate Himbacine HL-031,120 Ipratropium bromide J-104,129 Hyoscyamine Mamba Toxin 3 Mamba Toxin 7 Mazaticol Mebeverine Methoctramine Metixene N-Ethyl-3-Piperidyl Benzilate N-Methyl-3-Piperidyl Benzilate Orphenadrine Otenzepad Oxybutynin PBID PD-102,807 PD-0298029 Phenglutarimide Phenyltoloxamine Pirenzepine Piroheptine Procyclidine Profenamine RU-47,213 SCH-57,790 SCH-72,788 SCH-217,443 Scopolamine/Hyoscine Solifenacin Telenzepine Tiotropium bromide Tolterodine Trihexyphenidyl Tripitamine Tropatepine Tropicamide WIN-2299 Xanomeline Zamifenacin; Others: 1st Generation Antihistamines (Brompheniramine chlorphenamine cyproheptadine dimenhydrinate diphenhydramine doxylamine mepyramine/pyrilamine phenindamine pheniramine tripelennamine triprolidine, etc) Tricyclic Antidepressants (Amitriptyline doxepin trimipramine, etc) Tetracyclic Antidepressants (Amoxapine maprotiline, etc) Typical Antipsychotics (Chlorpromazine thioridazine, etc) Atypical Antipsychotics (Clozapine olanzapine, etc.)

nAChR	Agonists: 5-HIAA A-84,543 A-366,833 A-582,941 A-867,744 ABT-202 ABT-418 ABT-560 ABT-894 Acetylcholine Altinicline Anabasine Anatoxin-a AR-R17779 Butinoline Butyrylcholine Carbachol Choline Cotinine Cytisine Decamethonium Desformylflustrabromine Dianicline Dimethylphenylpiperazinium Epibatidine Epiboxidine Ethanol Ethoxysebacylcholine EVP-4473 EVP-6124 Galantamine GTS-21 Ispronicline Lobeline MEM-63,908/RG-3487 Nicotine NS-1738 PHA-543,613 PHA-709,829 PNU-120,596 PNU-282,987 Pozanicline Rivanicline RJR-2429 Sazetidine A Sebacylcholine SIB-1508Y SIB-1553A SSR-180,711 Suberylcholine Suxamethonium/Succinylcholine TC-1698 TC-1734 TC-1827 TC-2216 TC-5214 TC-5619 TC-6683 Tebanicline Tropisetron UB-165 Varenicline WAY-317,538 XY-4083 Antagonists: 18-Methoxycoronaridine α-Bungarotoxin α-Conotoxin Alcuronium Amantadine Anatruxonium Atracurium Bupropion Chandonium Chlorisondamine Cisatracurium Coclaurine Coronaridine Dacuronium Decamethonium Dextromethorphan Dextropropoxyphene Dextrorphan Diadonium DHβE Dihydrochandonium Dimethyltubocurarine/Metocurine Dipyrandium Dizocilpine/MK-801 Doxacurium Esketamine Fazadinium Gallamine Hexafluronium Hexamethonium/Benzohexonium Ibogaine Isoflurane Ketamine Kynurenic acid Laudexium/Laudolissin Levacetylmethadol Malouetine Mecamylamine Memantine Methadone (Levomethadone) Methorphan/Racemethorphan Methyllycaconitine Metocurine Mivacurium Morphanol/Racemorphan Neramexane Nitrous Oxide Pancuronium Pempidine Pentamine Pentolinium Phencyclidine Pipecuronium Radafaxine Rapacuronium Rocuronium Surugatoxin Thiocolchicoside Toxiferine Trimethaphan Tropeinium Tubocurarine Vecuronium Xenon

Reuptake inhibitors

Plasmalemmal

CHT Inhibitors	Hemicholinium-3/Hemicholine Triethylcholine

Vesicular

VAChT Inhibitors	Vesamicol

Enzyme inhibitors

Anabolism

ChAT inhibitors	1-(-Benzoylethyl)pyridinium 2-(α-Naphthoyl)ethyltrimethylammonium 3-Chloro-4-stillbazole 4-(1-Naphthylvinyl)pyridine Acetylseco hemicholinium-3 Acryloylcholine AF64A B115 BETA CM-54,903 N,N-Dimethylaminoethylacrylate N,N-Dimethylaminoethylchloroacetate

Catabolism

AChE inhibitors	Reversible: Carbamates: Aldicarb Bendiocarb Bufencarb Carbaryl Carbendazim Carbetamide Carbofuran Chlorbufam Chloropropham Ethienocarb Ethiofencarb Fenobucarb Fenoxycarb Formetanate Furadan Ladostigil Methiocarb Methomyl Miotine Oxamyl Phenmedipham Pinmicarb Pirimicarb Propamocarb Propham Propoxur; Stigmines: Ganstigmine Neostigmine Phenserine Physostigmine Pyridostigmine Rivastigmine; Others: Acotiamide Ambenonium Donepezil Caffeine Edrophonium Galantamine Huperzine A Minaprine Tacrine Zanapezil Irreversible: Organophosphates: Acephate Azinphos-methyl Bensulide Cadusafos Chlorethoxyfos Chlorfenvinphos Chlorpyrifos Chlorpyrifos-Methyl Coumaphos Cyclosarin Demeton Demeton-S-Methyl Diazinon Dichlorvos Dicrotophos Diisopropyl fluorophosphate Diisopropylphosphate Dimethoate Dioxathion Disulfoton EA-3148 Echothiophate Ethion Ethoprop Fenamiphos Fenitrothion Fenthion Fosthiazate GV Isofluorophate Isoxathion Malaoxon Malathion Methamidophos Methidathion Metrifonate Mevinphos Monocrotophos Naled Novichok agent Omethoate Oxydemeton-Methyl Paraoxon Parathion Parathion-Methyl Phorate Phosalone Phosmet Phoxim Pirimiphos-Methyl Sarin Soman Tabun Tebupirimfos Temefos Terbufos Tetrachlorvinphos Tribufos Trichlorfon VE VG VM VR VX; Others: Demecarium Onchidal (Onchidella binneyi)

BChE inhibitors	Cymserine * Many of the acetylcholinesterase inhibitors listed above act as butyrylcholinesterase inhibitors.

Others

Precursors	Choline (Lecithin) Citicoline Cyprodenate Dimethylethanolamine Glycerophosphocholine Meclofenoxate/Centrophenoxine Phosphatidylcholine Phosphatidylethanolamine Phosphorylcholine Pirisudanol

Cofactors	Acetic acid Acetylcarnitine Acetyl-coA Vitamin B₅ (Pantethine Pantetheine Panthenol)

Others	Acetylcholine releasing agents: α-Latrotoxin β-Bungarotoxin; Acetylcholine release inhibitors: Botulinum toxin (Botox); Acetylcholinesterase reactivators: Asoxime Obidoxime Pralidoxime

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