Phentolamine

Phentolamine is a potent, selective and orally active α1 adrenergic and α2 adrenergic receptor antagonist. Phentolamine can be used for the treatment of erectile dysfunction[1][2][3].

Research Areas >> Endocrinology

Signaling Pathways >> GPCR/G Protein >> Adrenergic Receptor

Phentolamine (5-20 mg/kg; i.p.) effectively inhibits the seizures elicited by strychnine (2 mg/kg, i.p.) and attenuates the seizure-potentiating effect of DOPS (4 mg/kg, i.p.) in mouse[2]. Phentolamine (1 mg/kg; i.p.) increases insulin secretion by inhibition of b-cell a2A-adrenoceptors in mouse[3]. Animal Model: WT mice[3] Dosage: 1 mg/kg Administration: IP Result: Reduced blood glucose and increased insulin levels.

[1]. Goldstein I I. Oral phentolamine: an alpha-1, alpha-2 adrenergic antagonist for the treatment of erectile dysfunction. Int J Impot Res. 2000 Mar;12(S1):S75-S80

[2]. Amabeoku G, et al. Strychnine-induced seizures in mice: the role of noradrenaline. Prog Neuropsychopharmacol Biol Psychiatry. 1994 Jul;18(4):753-63.

[3]. Fagerholm V, et al. alpha2A-adrenoceptor antagonism increases insulin secretion and synergistically augments the insulinotropic effect of glibenclamide in mice. Br J Pharmacol. 2008 Jul;154(6):1287-96.

DATA ITEMS CITED :

7

MOLECULAR FORMULA :

C17-H19-N3-O

MOLECULAR WEIGHT :

281.39

WISWESSER LINE NOTATION :

T5M CN BUTJ B1NR CQ&R D1

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Oral

SPECIES OBSERVED :

Rodent - mouse

DOSE/DURATION :

1 gm/kg

TOXIC EFFECTS :

Details of toxic effects not reported other than lethal dose value

REFERENCE :

AIPTAK Archives Internationales de Pharmacodynamie et de Therapie. (Heymans Institute of Pharmacology, De Pintelaan 185, B-9000 Ghent, Belgium) V.4- 1898- Volume(issue)/page/year: 112,319,1957

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Intraperitoneal

SPECIES OBSERVED :

Rodent - mouse

DOSE/DURATION :

200 mg/kg

TOXIC EFFECTS :

Sense Organs and Special Senses (Eye) - ptosis Behavioral - tremor Behavioral - ataxia

REFERENCE :

ARZNAD Arzneimittel-Forschung. Drug Research. (Editio Cantor Verlag, Postfach 1255, W-7960 Aulendorf, Fed. Rep. Ger.) V.1- 1951- Volume(issue)/page/year: 21,1727,1971

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Intravenous

SPECIES OBSERVED :

Rodent - mouse

DOSE/DURATION :

35 mg/kg

TOXIC EFFECTS :

Details of toxic effects not reported other than lethal dose value

REFERENCE :

AIPTAK Archives Internationales de Pharmacodynamie et de Therapie. (Heymans Institute of Pharmacology, De Pintelaan 185, B-9000 Ghent, Belgium) V.4- 1898- Volume(issue)/page/year: 105,317,1956

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Oral

SPECIES OBSERVED :

Rodent - rabbit

DOSE/DURATION :

2 gm/kg

TOXIC EFFECTS :

Details of toxic effects not reported other than lethal dose value

REFERENCE :

CLDND* Compilation of LD50 Values of New Drugs. (J.R. MacDougal, Dept. of National Health and Welfare, Food and Drug Divisions, 35 John St., Ottawa, Ont., Canada)

TYPE OF TEST :

LDLo - Lowest published lethal dose

ROUTE OF EXPOSURE :

Subcutaneous

SPECIES OBSERVED :

Rodent - rabbit

DOSE/DURATION :

200 mg/kg

TOXIC EFFECTS :

Peripheral Nerve and Sensation - spastic paralysis with or without sensory change Behavioral - convulsions or effect on seizure threshold

REFERENCE :

SMWOAS Schweizerische Medizinische Wochenschrift. (Schwabe & Co., Steintorst 13, 4010 Basel, Switzerland) V.50- 1920- Volume(issue)/page/year: 81,352,1951

TYPE OF TEST :

LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :

Intravenous

SPECIES OBSERVED :

Rodent - rabbit

DOSE/DURATION :

28 mg/kg

TOXIC EFFECTS :

Lungs, Thorax, or Respiration - dyspnea Lungs, Thorax, or Respiration - cyanosis Lungs, Thorax, or Respiration - respiratory depression

REFERENCE :

AIPTAK Archives Internationales de Pharmacodynamie et de Therapie. (Heymans Institute of Pharmacology, De Pintelaan 185, B-9000 Ghent, Belgium) V.4- 1898- Volume(issue)/page/year: 174,243,1968 ** REPRODUCTIVE DATA **

TYPE OF TEST :

TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :

Intravenous

DOSE :

100 ug/kg

SEX/DURATION :

female 8 day(s) after conception

TOXIC EFFECTS :

Reproductive - Maternal Effects - uterus, cervix, vagina

REFERENCE :

DPTHDL Developmental Pharmacology and Therapeutics. (S. Karger Pub., Inc., 79 Fifth Ave., New York, NY 10003) V.1- 1980- Volume(issue)/page/year: 7(Suppl 1),72,1984