title: [Toxicity studies of landiolol hydrochloride (ONO-1101) (2). 4-week repeated dose intravenous toxicity study in rats with 4-week recovery test].
abstract: 4-week repeated dose toxicity study with 4-week recovery test of landiolol hydrochloride (ONO-1101), a novel ultra short acting beta-blocker, was conducted in Sprague-Dawley (SD) rats. ONO-1101 was administered intravenously to rats of both sexes at a dose level of 0 (control), 12.5, 25, 50 or 100 mg/kg/day. In the 100 mg/kg/day group, bradypnea or dyspnea was seen in all animals, pale in ear, eye and foot, tremor, reddish lacrimation and loss of righting reflex were also observed in some animals right after administration, and then those signs disappeared within 1 min after administration. During the treatment period, 3/20 animals of each sex in the 100 mg/kg/day showed clonic convulsion and died within 2 min after administration. No clinical changes were seen in the 50 mg/kg/day group or lower. Histopathological findings showed atrophy of the submaxillary gland in females and vessel-wall thickening and perivascular fibrosis of the injection site (tail) in both sexes at 100 mg/kg/day, however those changes were reversible. ONO-1101 did not effect on body weight, food consumption, ophthalmology, urinalysis, hematology, blood chemistry, organ weights or necropsy at any doses. These results indicate that the no-adverse-effect level of ONO-1101 in rats is 50 mg/kg/day for both sexes in this study.
authors.affiliation: Fukui Institute for Safety Research, Ono Pharmaceutical Co., Ltd., Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yamaguchi
authors.forename: H
authors.initials: H
authors.lastname: Yanagi
authors.forename: K
authors.initials: K
authors.lastname: Shimizu
authors.forename: M
authors.initials: M
authors.lastname: Sakai
authors.forename: K
authors.initials: K
authors.lastname: Nishibata
authors.forename: H
authors.initials: H
authors.lastname: Oida
authors.forename: K
authors.initials: K
authors.lastname: Shinomiya
authors.forename: Y
authors.initials: Y
authors.lastname: Suzuki
authors.forename: H
authors.initials: H
authors.lastname: Yonezawa
authors.forename: T
authors.initials: T
authors.lastname: Fujita
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000008:administration & dosage / Q000633:toxicity*; D000818:Animals; D001769:Blood / Q000187:drug effects; D001835:Body Weight / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004435:Eating / Q000187:drug effects; D005123:Eye / Q000187:drug effects; D005260:Female; D007275:Injections, Intravenous; D008297:Male; D009025:Morpholines / Q000008:administration & dosage / Q000633:toxicity*; D009929:Organ Size / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D012018:Reflex / Q000187:drug effects; D012119:Respiration / Q000187:drug effects; D013997:Time Factors; D014508:Urea / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000633:toxicity; D014556:Urine
chemical_list: D000319:Adrenergic beta-Antagonists; D009025:Morpholines; C077049:landiolol; D014508:Urea