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Brand names,
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Analogs
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Brand Names Mixture
- Phenergan VC Expectorant Syrup (Phenylephrine hydrochloride + Potassium guaiacol sulphonate + Promethazine hydrochloride)
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Chemical_Formula
C17H20N2S
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RX_link
http://www.rxlist.com/cgi/generic3/phenergan.htm
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fda sheet
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msds (material safety sheet)
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Synthesis Reference
Charpentier, U.S. Pat. 2,503,451 (1950)
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Molecular Weight
284.42 g/mol
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Melting Point
60oC
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H2O Solubility
Freely soluble
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State
Solid
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LogP
4.946
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Dosage Forms
Tablet; Suppository; Opthalmic drops; Syrup
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Indication
For the treatment of allergic disorders, itching, nausea and vomiting.
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Pharmacology
Promethazine, a phenothiazine, is an H1-antagonist with anticholinergic, sedative, and antiemetic effects and some local anesthetic properties. Promethazine is used as an antiemetic or to prevent motion sickness.
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Absorption
On average, 88% of a promethazine dose is absorbed after oral administration; however, the absolute bioavailability is only 25% because of first-pass clearance.
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side effects and Toxicity
Symptoms of overdose include mild depression of the central nervous system and cardiovascular system to profound hypotension, respiratory depression, unconsciousness, and sudden death. Other reported reactions include hyperreflexia, hypertonia, ataxia, athetosis, and extensor-plantar reflexes (Babinski reflex). LD50=55mg/kg (I.V. in mice)
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Patient Information
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Organisms Affected
Humans and other mammals