Difenhydramin
Brand names,
Difenhydramin
Analogs
Difenhydramin
Brand Names Mixture
- Ambenyl Cough Syrup (Ammonium Chloride + Bromodiphenhydramine Hydrochloride + Codeine Phosphate + Diphenhydramine Hydrochloride + Potassium Guaiacol Sulphonate)
- Benadryl Decongestant Tablets (Diphenhydramine Hydrochloride + Pseudoephedrine Hydrochloride)
- Bye Bye Bite Lot (Benzocaine + Diphenhydramine Hydrochloride + Menthol)
- Caladryl Cream (Calamine + Diphenhydramine Hydrochloride)
- Caladryl Lotion (Calamine + Diphenhydramine Hydrochloride)
- Calamine Lotion W Antihistamine (Calamine + Diphenhydramine Hydrochloride)
- Calamine Lotion with Antih Lot (Calamine + Diphenhydramine Hydrochloride + Zinc Oxide)
- Calamine W Antihistamine Lotion (Calamine + Diphenhydramine Hydrochloride)
- Calmylin #4 Syr (Ammonium Chloride + Dextromethorphan Hydrobromide + Diphenhydramine Hydrochloride)
- Children's Tylenol Allergy - D Chewable Tablets (Acetaminophen + Diphenhydramine Hydrochloride + Pseudoephedrine Hydrochloride)
- Children's Tylenol Allergy-D Suspension (Acetaminophen + Diphenhydramine Hydrochloride + Pseudoephedrine Hydrochloride)
- Contac Day & Night Sinus/Allergy Caplet (Acetaminophen + Diphenhydramine Hydrochloride + Pseudoephedrine Hydrochloride)
- Contac-C Ext.Stren.Night Time Cough,Cold&Flu (Acetaminophen + Diphenhydramine Hydrochloride + Pseudoephedrine Hydrochloride)
- Cough Syr W Codeine Diphenhyd Hcl & Ammon Cl (Ammonium Chloride + Codeine Phosphate + Diphenhydramine Hydrochloride)
- Dm Cough Syr (Ammonium Chloride + Dextromethorphan Hydrobromide + Diphenhydramine Hydrochloride)
- Dm Plus Cough Syrup (Ammonium Chloride + Dextromethorphan Hydrobromide + Diphenhydramine Hydrochloride)
- Dm Syrup (Ammonium Chloride + Dextromethorphan Hydrobromide + Diphenhydramine Hydrochloride)
- Pulmorex Expectorant Liq (Ammonium Chloride + Diphenhydramine Hydrochloride + Guaifenesin)
- Salonpas Medicated Plaster (Borneol + Camphor + Diphenhydramine + Menthol + Methyl Salicylate + Olive Oil + Rosin + Thymol + Zinc Oxide)
- Sinutab N.T. Regular Strength Caplets (Acetaminophen + Diphenhydramine Hydrochloride + Pseudoephedrine Hydrochloride)
- Sting Kure - Liq (Benzocaine + Camphor + Diphenhydramine Hydrochloride + Phenol)
- Sting-Eze-Liq (Benzocaine + Camphor + Diphenhydramine Hydrochloride + Phenol)
- Suppress Cough Syr W.Cod.Diphen.Hcl Amm.Chl. (Ammonium Chloride + Codeine Phosphate + Diphenhydramine Hydrochloride)
Difenhydramin
Chemical_Formula
C17H21NO
Difenhydramin
RX_link
http://www.rxlist.com/cgi/generic/dihydram.htm
Difenhydramin
fda sheet
Difenhydramin
msds (material safety sheet)
Difenhydramin
Synthesis Reference
Rieveschl, Jr., U.S. pat. 2,421,714,; 2,427,878 (both 1947 to Parke, Davis), cf. U.S. pat. 2,397,799 (1946)
Difenhydramin
Molecular Weight
255.355 g/mol
Difenhydramin
Melting Point
166-170 oC
Difenhydramin
H2O Solubility
1 g/ml
Difenhydramin
State
Solid
Difenhydramin
LogP
3.753
Difenhydramin
Dosage Forms
Capsule; Oral solution; Tablet; Tablet (chewable); Tablet (film-coated); Elixir; Injection; Cream; Gel; Topical solution; Topical stick
Difenhydramin
Indication
For the treatment of symptoms associated with Vertigo/Meniere's disease, nausea and vomiting, motion sickness and insect bite.
Difenhydramin
Pharmacology
Diphenhydramine is an antihistamine of the ethanolamine class. Ethanolamine antihistamines have significant antimuscarinic activity and produce marked sedation in most patients. In addition to the usual allergic symptoms, the drug also treats irritant cough and nausea, vomiting, and vertigo associated with motion sickness. It also is used commonly to treat drug-induced extrapyramidal symptoms as well as to treat mild cases of Parkinson's disease. Rather than preventing the release of histamine, as do cromolyn and nedocromil, diphenhydramine competes with free histamine for binding at HA-receptor sites. Diphenhydramine competitively antagonizes the effects of histamine on HA-receptors in the GI tract, uterus, large blood vessels, and bronchial muscle. Ethanolamine derivatives have greater anticholinergic activity than do other antihistamines, which probably accounts for the antidyskinetic action of diphenhydramine. This anticholinergic action appears to be due to a central antimuscarinic effect, which also may be responsible for its antiemetic effects, although the exact mechanism is unknown.
Difenhydramin
Absorption
Quickly absorbed with maximum activity occurring in approximately one hour.
Difenhydramin
side effects and Toxicity
LD50=500 mg/kg (Orally in rats)
Difenhydramin
Patient Information
Difenhydramin
Organisms Affected
Humans and other mammals