A bridging study of LU 25-109 in patients with probable Alzheimer's disease.
Lu 25-109 is a functionally selective partial M1 agonist with M2/M3 antagonist properties. This double-blind, placebo-controlled, two-part, inpatient bridging study was designed to evaluate the safety and tolerability of multiple oral doses of Lu 25-109 in patients with Alzheimer's Disease(AD), and to determine the maximum tolerated dose (MTD) in this population. In the first part of the study, the fixed-dose MTD was to be determined in five consecutive panels of 6 patients each (4 Lu 25-109/2 placebo). Doses for the five panels were 100, 125, 150, 200, and 225 mg tid for 7 days. Cholinergic adverse events such as increased salivation, dizziness, and gastrointestinal symptoms were observed at all doses studied. The dosing of fixed-dose panels was discontinued after 3 days at 200 mg tid due to unacceptable gastrointestinal adverse events. Thus, 150 mg tid was defined as the fixed-dose MTD. The second part of the study, conducted in a single panel of 8 patients (6 Lu 25-109/2 placebo), was designed to determine if patients could tolerate higher doses of Lu 25-109 when administered on a titration regimen. Patients were to receive doses that were 50%, 75%, 100%, 125%, and 150% of the fixed dose MTD, with dose increases every five days. The first dose, 75 mg tid, was very well-tolerated; however, as in the first phase of the study, patients did not tolerate the 200 mg tid dose. Thus, the titration regimen employed did not improve the overall tolerability of Lu 25-109.
Sramek
J J
JJ
California Clinical Trials, Beverly Hills, 90211, USA.
Forrest
M
M
Mengel
H
H
Jhee
S S
SS
Hourani
J
J
Cutler
N R
NR
D000368:Aged; D000544:Alzheimer Disease / Q000188:drug therapy*; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018721:Muscarinic Agonists / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D010919:Placebos; D011725:Pyridines / Q000009:adverse effects / Q000494:pharmacology / Q000627:therapeutic use*; D013777:Tetrazoles / Q000009:adverse effects / Q000494:pharmacology / Q000627:therapeutic use*
C108369:LU 25-109-T; D018721:Muscarinic Agonists; D010919:Placebos; D011725:Pyridines; D013777:Tetrazoles