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Clinical data | |
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Pronunciation | /ˌdaɪfɛnˈhaɪdrəmiːn/ |
Trade names | Benadryl, Unisom, Sominex, others |
AHFS/Drugs.com | Monograph |
MedlinePlus | a682539 |
Pregnancy category | |
Dependence liability | Very low |
Routes of administration | By mouth, intramuscular injection, intravenous, topical, rectal |
ATC code |
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Legal status | |
Legal status | |
Pharmacokinetic data | |
Bioavailability | 40–60%[2] |
Protein binding | 98–99% |
Metabolism | Liver (CYP2D6 (80%), CYP3A4 (10%))[1] |
Elimination half-life | Range: 2.4–13.5 hrs[3][2][4] |
Excretion | Urine: 94%[5] Feces: 6%[5] |
Identifiers | |
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CAS Number |
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PubChemCID | |
IUPHAR/BPS | |
DrugBank | |
ChemSpider |
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UNII | |
KEGG |
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ChEBI | |
ChEMBL |
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CompTox Dashboard(EPA) | |
ECHA InfoCard | |
Chemical and physical data | |
Formula | C17H21NO |
Molar mass | 255.355 g/mol g·mol−1 |
3D model (JSmol) | |
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(what is this?)(verify) |
Diphenhydramine is an antihistamine mainly used to treat allergies.[6] It is also used for insomnia, symptoms of the common cold, tremor in parkinsonism, and nausea.[6] It is used by mouth, injection into a vein, and injection into a muscle.[6] Maximal effect is typically around two hours after a dose, and effects can last for up to seven hours.[6]
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Common side effects include sleepiness, poor coordination, and an upset stomach.[6] Its use is not recommended in young children or the elderly.[6][7] There is no clear risk of harm when used during pregnancy; however, use during breastfeeding is not recommended.[8] It is a first generation H1-antihistamine and works by blocking certain effects of histamine.[6] Diphenhydramine is also an anticholinergic.[9]
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Diphenhydramine was first made by George Rieveschl and came into commercial use in 1946.[10][11] It is available as a generic medication.[6] The wholesale price in the developing world as of 2014 is about US$0.01 per dose.[12] In the United States, it costs less than US$25 for a typical month’s supply.[13] It is sold under the trade name Benadryl, among others.[6] In 2016 it was the 210th most prescribed medication in the United States with more than 2 million prescriptions.[14]
- 1Medical uses
- 5Pharmacology
- 6Chemistry
- 8Society and culture
Medical uses[edit]
Diphenhydramine is a first-generation antihistamine used to treat a number of conditions including allergic symptoms and itchiness, the common cold, insomnia, motion sickness, and extrapyramidal symptoms.[15][16] Diphenhydramine also has local anesthetic properties, and has been used as such in people allergic to common local anesthetics such as lidocaine.[17]
Allergies[edit]
Diphenhydramine is effective in treatment of allergies.[18] As of 2007, it was the most commonly used antihistamine for acute allergic reactions in the emergency department.[19]
By injection it is often used in addition to epinephrine for anaphylaxis.[20] Its use for this purpose had not been properly studied as of 2007.[21] Its use is only recommended once acute symptoms have improved.[18]
Topical formulations of diphenhydramine are available, including creams, lotions, gels, and sprays. These are used to relieve itching and have the advantage of causing fewer systemic effects (e.g., drowsiness) than oral forms.[22]
Movement disorders[edit]
Diphenhydramine is used to treat Parkinson's disease–likeextrapyramidal symptoms caused by antipsychotics.[23]
Sleep[edit]
Because of its sedative properties, diphenhydramine is widely used in nonprescription sleep aids for insomnia. The drug is an ingredient in several products sold as sleep aids, either alone or in combination with other ingredients such as acetaminophen (paracetamol) in Tylenol PM or ibuprofen in Advil PM. Diphenhydramine can cause minor psychological dependence.[24] Diphenhydramine can cause sedation and has also been used as an anxiolytic.[25]
Nausea[edit]
Diphenhydramine also has antiemetic properties, which make it useful in treating the nausea that occurs in vertigo and motion sickness.[26]
Special populations[edit]
Diphenhydramine is not recommended for people older than 60 or children under the age of six, unless a physician is consulted.[6][27][7] These populations should be treated with second-generation antihistamines such as loratadine, desloratadine, fexofenadine, cetirizine, levocetirizine, and azelastine.[28] Due to its strong anticholinergic effects, diphenhydramine is on the 'Beers list' of drugs to avoid in the elderly.[29][30]
Diphenhydramine is category B in the FDA Classification of Drug Safety During Pregnancy.[31] It is also excreted in breast milk.[32]Paradoxical reactions to diphenhydramine have been documented, in particular among children, and it may cause excitation instead of sedation.[33]
Topical diphenhydramine is sometimes used especially for people in hospice. This use is without indication and topical diphenhydramine should not be used as treatment for nausea because research does not indicate this therapy is more effective than alternatives.[34]
Adverse effects[edit]
The most prominent side effect is sedation. A typical dose creates driving impairment equivalent to a blood-alcohol level of 0.10 which is higher than the 0.08 limit of most drunk driving laws.[19]
Psn can i get a refund if u didnt download game. Diphenhydramine is a potent anticholinergic agent. This activity is responsible for the side effects of dry mouth and throat, increased heart rate, pupil dilation, urinary retention, constipation, and, at high doses, hallucinations or delirium. Other side effects include motor impairment (ataxia), flushed skin, blurred vision at nearpoint owing to lack of accommodation (cycloplegia), abnormal sensitivity to bright light (photophobia), sedation, difficulty concentrating, short-term memory loss, visual disturbances, irregular breathing, dizziness, irritability, itchy skin, confusion, increased body temperature (in general, in the hands and/or feet), temporary erectile dysfunction, and excitability, and although it can be used to treat nausea, higher doses may cause vomiting.[35]
Torsades de pointes can occur as a side effect of diphenhydramine
Some people have an allergic reaction to diphenhydramine in the form of hives.[36][37] However, restlessness or akathisia can also be a side effect made worse by increased levels of diphenhydramine, especially with recreational dosages.[33] As diphenhydramine is extensively metabolized by the liver, caution should be exercised when giving the drug to individuals with hepatic impairment.
Anticholinergic use later in life is associated with an increased risk for cognitive decline and dementia among older people.[38]
Overdose[edit]
Diphenhydramine overdose symptoms may include[39]
- Euphoria or dysphoria
- Hallucinations (auditory, visual, etc.)
- Heart palpitations
- Extreme drowsiness
- Severe dizziness
- Abnormal speech (inaudibility, forced speech, etc.)
- Flushed skin
- Severe mouth and throat dryness
- Tremors
- Inability to urinate
- Acute megacolon
- Motor disturbances
- Anxiety/nervousness
- Abdominal pain
- Coma
- Death
Acute poisoning can be fatal, leading to cardiovascular collapse and death in 2–18 hours, and in general is treated using a symptomatic and supportive approach.[28] Diagnosis of toxicity is based on history and clinical presentation, and in general specific levels are not useful.[40] Several levels of evidence strongly indicate diphenhydramine (similar to chlorpheniramine) can block the delayed rectifierpotassium channel and, as a consequence, prolong the QT interval, leading to cardiac arrhythmias such as torsades de pointes.[41]No specific antidote for diphenhydramine toxicity is known, but the anticholinergic syndrome has been treated with physostigmine for severe delirium or tachycardia.[40]Benzodiazepines may be administered to decrease the likelihood of psychosis, agitation, and seizures in people who are prone to these symptoms.[42]
Interactions[edit]
Alcohol may increase the drowsiness caused by diphenhydramine.[43][44]
Pharmacology[edit]
Pharmacodynamics[edit]
Site | Ki (nM) | Species | Ref |
---|---|---|---|
SERT | ≥3,800 | Human | [46][47] |
NET | 960–2,400 | Human | [46][47] |
DAT | 1,100–2,200 | Human | [46][47] |
5-HT2A | 260 | Human | [47] |
5-HT2C | 780 | Human | [47] |
α1B | 1,300 | Human | [47] |
α2A | 2,900 | Human | [47] |
α2B | 1,600 | Human | [47] |
α2C | 2,100 | Human | [47] |
D2 | 20,000 | Rat | [48] |
H1 | 9.6–16 | Human | [49][47][47] |
H2 | >100,000 | Canine | [50] |
H3 | >10,000 | Human | [47][51][52] |
H4 | >10,000 | Human | [52] |
M1 | 80–100 | Human | [53][47] |
M2 | 120–490 | Human | [53][47] |
M3 | 84–229 | Human | [53][47] |
M4 | 53–112 | Human | [53][47] |
M5 | 30–260 | Human | [53][47] |
VGSC | 48,000–86,000 | Rat | [54] |
hERG | 27,100 (IC50) | Human | [55] |
Values are Ki (nM), unless otherwise noted. The smaller the value, the more strongly the drug binds to the site. |
Diphenhydramine, while traditionally known as an antagonist, acts primarily as an inverse agonist of the histamineH1 receptor.[56] It is a member of the ethanolamine class of antihistaminergic agents.[28] By reversing the effects of histamine on the capillaries, it can reduce the intensity of allergic symptoms. It also crosses the blood–brain barrier and inversely agonizes the H1 receptors centrally.[56] Its effects on central H1 receptors cause drowsiness.
Like many other first-generation antihistamines, diphenhydramine is also a potent antimuscarinic (a competitive antagonist of muscarinic acetylcholine receptors) and, as such, at high doses can cause anticholinergic syndrome.[57] The utility of diphenhydramine as an antiparkinson agent is the result of its blocking properties on the muscarinic acetylcholine receptors in the brain.
Diphenhydramine also acts as an intracellular sodium channel blocker, which is responsible for its actions as a local anesthetic.[54] Diphenhydramine has also been shown to inhibit the reuptake of serotonin.[58] It has been shown to be a potentiator of analgesia induced by morphine, but not by endogenous opioids, in rats.[59] The drug has also been found to act as an inhibitor of histamine N-methyltransferase (HNMT).[60][61][61]
Biological target | Mode of action | Effect |
---|---|---|
H1 receptor | inverse agonist | Allergy reduction; Sedation |
mACh receptors | Antagonist | Anticholinergic; Antiparkinson |
Sodium channels | Blocker | Local anesthetic |
Pharmacokinetics[edit]
Oral bioavailability of diphenhydramine is in the range of 40% to 60%, and peak plasma concentration occurs about 2 to 3 hours after administration.[2] The primary route of metabolism is two successive demethylations of the tertiary amine. The resulting primary amine is further oxidized to the carboxylic acid.[2] The elimination half-life of diphenhydramine has not been fully elucidated, but appears to range between 2.4 and 9.3 hours in healthy adults.[3] A 1985 review of antihistamine pharmacokinetics found that the elimination half-life of diphenhydramine ranged between 3.4 and 9.3 hours across five studies, with a median elimination half-life of 4.3 hours.[2] A subsequent 1990 study found that the elimination half-life of diphenhydramine was 5.4 hours in children, 9.2 hours in young adults, and 13.5 hours in the elderly.[4]
Chemistry[edit]
Diphenhydramine is a diphenylmethanederivative. Analogues of diphenhydramine include orphenadrine, an anticholinergic, nefopam, an analgesic, and tofenacin, an antidepressant.
Detection in body fluids[edit]
Diphenhydramine can be quantified in blood, plasma, or serum.[62]Gas chromatography with mass spectrometry (GC-MS) can be used with electron ionization on full scan mode as a screening test. GC-MS or GC-NDP can be used for quantification.[62] Rapid urine drug screens using immunoassays based on the principle of competitive binding may show false-positive methadone results for people having ingested diphenhydramine.[63] Quantification can be used to monitor therapy, confirm a diagnosis of poisoning in people who are hospitalized, provide evidence in an impaired driving arrest, or assist in a death investigation.[62]
Lippincott's Pharmacology 6th Edition
History[edit]
Diphenhydramine was discovered in 1943 by George Rieveschl, a former professor at the University of Cincinnati.[64][65] In 1946, it became the first prescription antihistamine approved by the U.S. FDA.[66]
In the 1960s diphenhydramine was found to inhibit reuptake of the neurotransmitterserotonin.[58] This discovery led to a search for viable antidepressants with similar structures and fewer side effects, culminating in the invention of fluoxetine (Prozac), a selective serotonin reuptake inhibitor (SSRI).[58][67] A similar search had previously led to the synthesis of the first SSRI, zimelidine, from brompheniramine, also an antihistamine.[68]
Society and culture[edit]
Diphenhydramine is sometimes used recreationally as potentiator of opiates.[69] Diphenhydramine is deemed to have limited abuse potential in the United States owing to its potentially serious side-effect profile and limited euphoric effects, and is not a controlled substance. Since 2002, the U.S. FDA has required special labeling warning against use of multiple products that contain diphenhydramine.[70] In some jurisdictions, diphenhydramine is often present in postmortem specimens collected during investigation of sudden infant deaths; the drug may play a role in these events.[71][72]
Diphenhydramine is among prohibited and controlled substances in the Republic of Zambia,[73] and travelers are advised not to bring the drug into the country. Several Americans have been detained by the Zambian Drug Enforcement Commission for possession of Benadryl and other over-the-counter medications containing diphenhydramine.[74]
Recreational use[edit]
Although diphenhydramine is widely used and generally considered to be safe, multiple cases of abuse and addiction have been documented.[75] Because the drug is cheap and sold over the counter in most countries, adolescents without access to stronger, illicit drugs are particularly at risk.[76] People with mental health problems—especially those with schizophrenia—are also prone to abuse the drug, which is self-administered in large doses to treat extrapyramidal symptoms caused by the use of antipsychotics.[77]
Recreational users report calming effects, mild euphoria, and hallucinations as the desired effects of the drug.[77][78] Research has shown that antimuscarinic agents, such as diphenhydramine, 'may have antidepressant and mood-elevating properties.'[79] A study conducted on adult males with a history of sedative abuse found that subjects who were administered a high dose (400 mg) of diphenhydramine reported a desire to take the drug again, despite also reporting negative effects, such as difficulty concentrating, confusion, tremors, and blurred vision.[80]
Names[edit]
Diphenhydramine is marketed under the trade name Benadryl by McNeil Consumer Healthcare in the U.S., Canada, and South Africa. Trade names in other countries include Dimedrol, Daedalon, and Nytol. It is also available as a generic medication.
Procter & Gamble markets an over-the-counter formulation of diphenhydramine as a sleep aid under the brand ZzzQuil. In 2014 this product had annual sales of over $120 million and had a 29.3% share of the $411 million sleep-aid market category.[81]
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Lippincott Pharmacology Pdf Free Download
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Further reading[edit]
- Lieberman JA (2003). 'History of the use of antidepressants in primary care'(PDF). Primary Care Companion J. Clinical Psychiatry. 5 (supplement 7): 6–10.
- Cox D, Ahmed Z, McBride AJ (March 2001). 'Diphenhydramine dependence'. Addiction. 96 (3): 516–7. doi:10.1046/j.1360-0443.2001.96350713.x. PMID11310441.
- Björnsdóttir I, Einarson TR, Gudmundsson LS, Einarsdóttir RA (December 2007). 'Efficacy of diphenhydramine against cough in humans: a review'. Pharmacy World & Science. 29 (6): 577–83. doi:10.1007/s11096-007-9122-2. PMID17486423.
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