Adverse Drug Reaction Classification System

Pharmaceutical Information
Drug Name Diphenhydramine hydrochloride
Drug ID BADD_D00687
Description Diphenhydramine - perhaps known most commonly as its brand name formulation Benadryl - is a first-generation H1 receptor antihistamine that is used extensively for the treatment of seasonal allergies, insect bites and stings, and rashes [L5263, L5266, L5269, F3379]. However, it also has antiemetic, antitussive, hypnotic, and antiparkinson properties [L5269, F3352]. As histamine receptors exist both peripherally and in the central nervous system, diphenhydramine has been shown to cause sedation due to its competitive antagonism of histamine H1 receptors within the central nervous system [L5263, L5266, L5269, F3379, A174541]. While its use in allergy therapy can sometimes fall out of favor due to its sedative effect, diphenhydramine has been repurposed for use within many non-prescription over-the-counter sleep aids and cough-and-cold medications that have been marketed for "night time" use [L5263, L5281, L5287]. Diphenhydramine is also used in combination with [DB14132] as the anti-nausea drug [DB00985] where it is utilized primarily for its antagonism of H1 histamine receptors within the vestibular system [A1540]. Diphenhydramine has also been shown to be implicated in a number of neurotransmitter systems that affect behaviour including dopamine, norepinephrine, serotonin, acetylcholine, and opioid [A1539]. As a result, diphenhydramine is being investigated for its anxiolytic and anti-depressant properties.
Indications and Usage For the treatment of symptoms associated with Vertigo/Meniere's disease, nausea and vomiting, motion sickness and insect bite.
Marketing Status Prescription; Discontinued
ATC Code D04AA32; R06AA02
DrugBank ID DB01075
KEGG ID D00669
MeSH ID D004155
PubChem ID 8980
TTD Drug ID D01FGR
NDC Product Code 67457-124; 63323-664; 80159-104; 58602-500; 46994-660; 70000-0584; 68210-0203; 66715-6754; 59779-195; 68998-113; 71141-090; 68210-4089; 64728-071; 42571-337; 59726-691; 72036-090; 53345-005; 56062-462; 68210-1016; 58602-026; 55910-702; 76045-102; 53943-090; 68016-501; 70518-3410; 30142-554; 47682-184; 68163-710; 61474-4263; 61474-4262; 30142-549; 17714-023; 51114-0220; 55315-404; 63941-219; 54738-116; 73056-011; 0363-0293; 57344-090; 71205-315; 30142-229; 69842-264; 68210-6112; 55319-479; 70692-785; 53943-128; 72485-101; 69842-392; 55910-431; 0904-5306; 55910-091; 68016-712; 58602-517; 66715-6814; 41250-893; 68210-1250; 63941-860; 42806-649; 11673-292; 51013-181; 73056-008; 36800-669; 70518-1680; 63941-091; 69367-187; 68094-018; 55319-353; 53943-027; 37000-431; 67091-114; 41250-479; 68016-795; 66715-5454; 68071-3193; 36800-909; 0363-0100; 72036-113; 55154-5102; 36800-367; 56062-479; 70000-0207; 51316-998; 0904-6740; 63629-7718; 55700-580; 41520-778; 68210-4127; 46122-699; 54738-115; 52119-013; 37808-866; 62320-302; 64728-023; 11673-462; 58602-027; 79903-083; 81033-003; 10888-8209; 51316-779; 67091-354; 36800-436; 68788-7589; 37808-104; 67751-156; 67751-166; 41250-462; 60000-056; 70518-3332; 68016-219; 38779-0282; 37808-690; 68210-4157; 0363-9895; 55910-991; 55910-891; 49348-045; 50090-1841; 11014-0055; 63941-413; 41163-613; 29485-1007; 47682-167; 36800-413; 0404-9851; 51013-144; 36800-937; 36800-910; 73056-007; 71872-7005; 42806-648; 53942-505; 64728-070; 58602-024; 68210-4179; 68210-0230; 10888-8138; 63868-772; 52412-100; 0113-1909; 70000-0585; 61010-4409; 67751-213; 17714-021; 36800-784; 53943-505; 46122-356; 50090-3788; 41163-290; 71679-106; 66715-5354; 53942-522; 17714-020; 46122-674; 0121-0489; 0904-6741; 76168-015; 65498-232; 10888-8241; 63941-090; 41520-996; 68210-0210; 72476-350; 55910-998; 67414-226; 0113-0462; 70000-0246; 11014-0019; 51879-802; 51879-163; 49588-0002; 50090-0878; 62579-226; 71335-0435; 69256-293; 68210-1280; 50486-616; 59779-893; 76281-505; 0121-0978; 50269-226; 11673-186; 66715-5654; 50580-228; 33992-0404; 59779-793; 0363-0753; 51013-199; 69423-965; 11822-0020; 0363-0710; 24385-431; 0363-8989; 73056-018; 61474-4225; 49035-986; 66715-5254; 68210-4195; 69842-261; 30142-116; 53345-027; 12294-9997; 70000-0174; 52584-376; 61010-8300; 58602-022; 30142-832; 53345-007; 49035-379; 58657-528; 17714-135; 0113-0479; 41250-316; 71205-259; 59779-431; 0121-1730; 37808-019; 63941-690; 72036-091; 72036-019; 63187-771; 68210-0123; 71872-7242; 70692-783; 37012-479; 61474-4280; 50580-226; 69842-836; 52904-960; 73921-023; 70692-832; 51013-142; 55910-379; 37808-252; 49035-600; 55319-404; 71205-410; 11822-1565; 51662-1219; 68210-1200; 70518-2438; 50580-843; 68210-4160; 55910-959; 80267-431; 71309-009; 63868-492; 41250-738; 0363-9181; 68210-1002; 0121-0865; 68166-001; 66267-977; 61281-6000; 67296-1645; 50580-370; 68210-1020; 68210-2010; 71872-7180; 60687-267; 55301-092; 51824-056; 63868-611; 50580-232; 72476-113; 69842-393; 63629-1160; 66715-6854; 24286-1565; 37000-930; 37835-615; 61474-4278; 49580-0293; 41250-853; 49452-2640; 69842-981; 55910-462; 66715-9746; 0363-7100; 50580-534; 69842-753; 68998-091; 50090-3867; 63187-167; 59917-089; 37808-590; 11673-690; 30142-847; 10888-8148; 66715-6654; 66715-6943; 69517-106; 72036-521; 66715-6803; 49483-329; 12711-4367; 21130-025; 15579-828; 66715-6843; 64024-479; 51013-104
Synonyms Diphenhydramine | Benzhydramine | Diphenylhydramine | Diphenylhydramin | 2-Diphenylmethoxy-N,N-dimethylethylamine | Benhydramin | Benadryl | Benylin | Diphenhydramine Citrate | Citrate, Diphenhydramine | Diphenhydramine Citrate (1:1) | Diphenhydramine Hydrochloride | Hydrochloride, Diphenhydramine | Dormin | Allerdryl | Dimedrol
Chemical Information
Molecular Formula C17H21NO.ClH
CAS Registry Number 147-24-0
SMILES CN(C)CCOC(C1=CC=CC=C1)C2=CC=CC=C2.Cl
Chemical Structure
ADR Related Proteins Induced by Drug
ADR Term Protein Name UniProt AC TTD Target ID PMID
Not AvailableNot AvailableNot AvailableNot AvailableNot Available
ADRs Induced by Drug
ADR Term ADReCS ID ADR Frequency (FAERS) ADR Severity Grade (FAERS) ADR Severity Grade (CTCAE)
Agitation19.06.02.001; 17.02.05.012--
Agranulocytosis01.02.03.001--Not Available
Anaphylactic shock24.06.02.004; 10.01.07.002--Not Available
Chest discomfort08.01.08.019; 02.02.02.009; 22.02.08.001--Not Available
Chills15.05.03.016; 08.01.09.001--
Confusional state19.13.01.001; 17.02.03.005--
Constipation07.02.02.001--
Coordination abnormal17.02.02.004--Not Available
Diarrhoea07.02.01.001--
Diplopia17.17.01.005; 06.02.06.002--Not Available
Dizziness24.06.02.007; 17.02.05.003; 02.01.02.004--
Drug eruption23.03.05.001; 10.01.01.005; 08.01.06.015--Not Available
Dry mouth07.06.01.002--
Dry throat22.02.05.004; 07.06.01.005--Not Available
Dyspepsia07.01.02.001--
Dysuria20.02.02.002--
Euphoric mood19.04.02.006--
Extrasystoles02.03.02.003--Not Available
Fatigue08.01.01.002--
Haemolytic anaemia01.06.03.002--Not Available
Headache17.14.01.001--
Hyperhidrosis23.02.03.004; 08.01.03.028--
Hypotension24.06.03.002--
Insomnia19.02.01.002; 17.15.03.002--
Irritability19.04.02.013; 08.01.03.011--
Labyrinthitis04.04.03.001; 11.01.05.002--Not Available
Menstruation irregular21.01.01.005; 05.05.01.008--
Nasal congestion22.04.04.001--
Nasal dryness22.04.03.002--Not Available
Nausea07.01.07.001--
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