Homatropine

Homatropine
Clinical data

AHFS/Drugs.com	Monograph
MedlinePlus	a601006
ATC code	A02BX03 (WHO) S01FA05 (WHO)
Legal status
Legal status	rx only, not FDA approved, only sold in UK
Identifiers
IUPAC name (N-Methyl-8-azabicyclo[3.2.1]oct-3-yl) 2-hydroxy-2-phenylacetate
CAS Number	87-00-3^N
PubChem (CID)	6321423
DrugBank	DB00725^N
ChemSpider	16498795^Y
UNII	8QS6WCL55Z^Y
ChEMBL	CHEMBL1233442^N
ECHA InfoCard	100.001.561
Chemical and physical data
Formula	C₁₆H₂₁NO₃
Molar mass	356.26 g/mol
3D model (Jmol)	Interactive image
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
^NY (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

Contraindications

References

Ophthalmologicals: mydriasis and cycloplegia (S01F)

Anticholinergics/antimuscarinics	Atropine Scopolamine Methylscopolamine Cyclopentolate Homatropine Tropicamide

Sympathomimetics	Phenylephrine Ephedrine Ibopamine

Cholinergics

Receptor ligands

mACh	Muscarinic 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 Itameline 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 Suberyldicholine Talsaclidine Tazomeline Thiopilocarpine Vedaclidine VU-0029767 VU-0090157 VU-0152099 VU-0152100 VU-0238429 WAY-132,983 Xanomeline YM-796 Muscarinic antagonists: 3-Quinuclidinyl benzilate 4-DAMP Aclidinium bromide Anisodamine Anisodine Antihistamines (first-generation) (e.g., brompheniramine, chlorphenamine, cyproheptadine, dimenhydrinate, diphenhydramine, doxylamine, mepyramine (pyrilamine), phenindamine, pheniramine, promethazine, tripelennamine, triprolidine) Atropine Atropine methonitrate Atypical antipsychotics (e.g., clozapine, olanzapine, quetiapine, zotepine) Benactyzine Benzatropine (benztropine) Benzilylcholine mustard 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 Caramiphen Cloperastine CS-27349 Cyclobenzaprine Cyclopentolate Darifenacin DAU-5884 Dimethindene Dexetimide DIBD Dicyclomine (dicycloverine) Ditran EA-3167 EA-3443 EA-3580 EA-3834 Etanautine Etybenzatropine (ethybenztropine) 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 Pipenzolate bromide Pirenzepine Piroheptine Procyclidine Profenamine Revefenacin RU-47,213 SCH-57,790 SCH-72,788 SCH-217,443 Scopolamine (hyoscine) Sofpironium bromide Solifenacin Telenzepine Tetracyclic antidepressants (e.g., amoxapine, maprotiline, mianserin, mirtazapine) Timepidium bromide Tiotropium bromide Tolterodine Tricyclic antidepressants (e.g., amitriptyline, butriptyline, clomipramine, desipramine, dosulepin (dothiepin), doxepin, imipramine, lofepramine, nortriptyline, protriptyline, trimipramine) Trihexyphenidyl Tripitamine Tropacine Tropatepine Tropicamide Typical antipsychotics (e.g., chlorpromazine, loxapine, thioridazine) WIN-2299 Xanomeline Zamifenacin

nACh	Nicotinic 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 Ivermectin Levamisole Lobeline MEM-63,908 (RG-3487) Morantel Nicotine (tobacco) NS-1738 PHA-543,613 PHA-709,829 PNU-120,596 PNU-282,987 Pozanicline Rivanicline RJR-2429 Sazetidine A SB-206553 Sebacylcholine SIB-1508Y SIB-1553A SSR-180,711 Suberyldicholine 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 Nicotinic antagonists: 18-MAC 18-MC α-Neurotoxins (e.g., α-bungarotoxin, α-cobratoxin, α-conotoxin, many others) ABT-126 Alcuronium Allopregnanolone Amantadine Anatruxonium AQW051 Atracurium Barbiturates (e.g., pentobarbital, sodium thiopental) Bungarotoxins (e.g., α-bungarotoxin, κ-bungarotoxin) Bupropion Chandonium Chlorisondamine Cisatracurium Coclaurine Coronaridine Cyclopropane Dacuronium Decamethonium Dehydronorketamine Desflurane Dextromethorphan Dextropropoxyphene Dextrorphan Diadonium DHβE Dihydrochandonium Dimethyltubocurarine (metocurine) Dipyrandium Dizocilpine (MK-801) Doxacurium Encenicline Enflurane Esketamine Fazadinium Gallamine Halothane Hexafluronium Hexamethonium (benzohexonium) Hydroxybupropion Hydroxynorketamine Ibogaine Isoflurane Ketamine Kynurenic acid Laudexium (laudolissin) Levacetylmethadol Levomethadone Malouetine ME-18-MC Mecamylamine Memantine Methadone Methorphan (racemethorphan) Methyllycaconitine Metocurine Mivacurium Morphanol (racemorphan) Neramexane Nitrous oxide Norketamine Pancuronium bromide Pempidine Pentamine Pentolinium Phencyclidine Pipecuronium Progesterone Promegestone Radafaxine Rapacuronium Reboxetine Rocuronium Sevoflurane Surugatoxin Thiocolchicoside Toxiferine Tramadol Trimetaphan camsilate (trimethaphan camsylate) Tropeinium Tubocurarine Vanoxerine Vecuronium Xenon

Transporter ligands

CHT	Inhibitors: Hemicholinium-3 (hemicholine) Triethylcholine Enhancers: Coluracetam

VAChT	Inhibitors: Vesamicol

Enzyme modulators

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

AChE	Inhibitors: Reversible: Carbamates: Aldicarb Bendiocarb Bufencarb Caffeine Carbaryl Carbendazim Carbetamide Carbofuran Chlorbufam Chloropropham Ethienocarb Ethiofencarb Fenobucarb Fenoxycarb Formetanate Furadan Itopride Ladostigil Methiocarb Methomyl Miotine Oxamyl Phenmedipham Pinmicarb Pirimicarb Propamocarb Propham Propoxur; Stigmines: Distigmine bromide Eptastigmine Ganstigmine Neostigmine Phenserine Physostigmine Pyridostigmine bromide Quilostigmine Rivastigmine Terestigmine; Others: Acotiamide Ambenonium Donepezil Caffeine Edrophonium Galantamine Huperzine A Ipidacrine 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 Fasciculins (green mamba toxins) (1, 2, 3, 4) Onchidal (Onchidella binneyi) Reactivators: Asoxime Obidoxime Pralidoxime

BChE	Inhibitors: Cymserine Many of the AChE inhibitors listed above

Release modulators

Inhibitors	SNAP-25 inactivators: Botulinum toxin (A, C, E) VAMP inactivators: Botulinum toxin (B, D, F, G) Others: Bungarotoxins (β-bungarotoxin, γ-bungarotoxin)

Enhancers	LPHN agonists: α-Latrotoxin Others: Atracotoxin (e.g., robustoxin, versutoxin) Crotoxin

Others

Precursors / prodrugs	Adafenoxate Choline (lecithin) Citicoline Cyprodenate Dimethylethanolamine Glycerophosphocholine Meclofenoxate (centrophenoxine) Phosphatidylcholine Phosphatidylethanolamine Phosphorylcholine Pirisudanol

Cofactors	Acetic acid Acetylcarnitine Acetyl-coA Vitamin B₅

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