Klaus Schaffler

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It is known that sedation by H1 antihistaminic drugs can be reduced or avoided if slow release formulations are used for their administration, probably because of a slower increase of the drug concentration in plasma and brain. The aim of this study was to compare two different formulations of dimenhydrinate (CAS 523-87-5), a single fast release tablet with(More)
The aim of the study was to evaluate the analgesic/antihyperalgesic efficacy and to establish the dose-response relationship of morphine immediate release (IR) and oxycodone IR in a human experimental algesimetric model. Calculated effect ratios for peak-to-peak (PtP) amplitudes of laser-evoked potentials (LEPs) and visual analog scales (VAS) postlaser pain(More)
The acute and subchronic effects of orally administered buspirone (acute: 15 mg; subchronic: 5 mg t.i.d.; Day 7:5 mg) and bromazepam (acute: 6 mg; subchronic: 2 mg t.i.d.; Day 7: 2 mg) on psychomotor and cognitive parameters were explored vs placebo in a randomized, double-blind crossover design with three periods in 12 healthy male volunteers. The washout(More)
Twelve healthy young males volunteered in this pilot-study to test the encephalotropic potency of a deproteinized hemodialysate of calf blood (Actovegin). This compound contains peptides, oligosaccharides and nucleinic acid derivatives, which are supposed to improve transport of glucose and oxygen into cells. The study is based on a placebo-controlled,(More)
The pharmaceutical industry faces tough times. Despite tremendous advances in the science and technology of new lead identification and optimization, attrition rates for novel drug candidates making it into the clinic remain unacceptably high. A seamless boundary between basic preclinical and clinical arms of the discovery process, embodying the concept of(More)
BACKGROUND Auditory evoked potentials (AEP) provide a correlate of cognitive dysfunction in schizophrenia. Both cognitive dysfunction and AEP-characteristics might be related to reduced glutamatergic neurotransmission as induced by glutamate-antagonist like ketamine. Hypericum extract LI160 has demonstrated a ketamine-antagonising effect. We examined(More)
The effects of flupirtine (CAS 56995-20-1, D-9998, Katadolon) on muscle force and related electromyographic (EMG) activity has been assessed in comparison to tetrazepam and placebo in 12 healthy male volunteers after oral single-dose administration and under steady-state conditions. Muscle functions primarily reflecting dynamic daily demands remained(More)
The effects of dimethindene maleate (CAS 3614-69-5) on the central nervous system-as sustained release pellets (Fenistil OAD; OAD = once a day) and sustained release tablets (Fenistil retard) with an immediate release fraction-were investigated by means of the oculodynamic test (ODT) and visual analogue scales and compared to loratadine (CAS 79794-75-5) and(More)
Most antihistamines are assumed to possess a more or less pronounced sedative potential in addition to their antihistaminic properties. Therefore, a single-blind three-way crossover study was designed to assess the influence of single-dose dimethindene maleate (new "once a day formulation") on vigilance and performance vs. loratadine as reference and vs.(More)
Target symptoms treated with Hypericum extract, i.e. somatisation, fatigue and depression could be related to an increased activity of glucocorticoids in the brain. One potential mechanism is the increased permeability of the blood-brain barrier for glucocorticoids. Hypericum extract LI160 reduces intracerebral glucocorticoid concentration possibly by its(More)