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The ANCOVA for the observations of a-wave and b-wave revealed a significant influence of the factor treatment on the amplitude of the a-wave, 2.4 cds/m2 (P=0.0152), as well as on the amplitude of the b-wave, 2.4 cds/m2 (P=0.0302) and 5 cds/m2 (P=0.0028).

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Blood drawings were taken for the determination of the plasma concentrations of BAY 38–7268 (free base of BAY 38–9456 vardenafil hydrochloride) and its major active metabolite BAY 44–5576 for population-pharmacokinetics at baseline (at screening) and at certain time intervals after administration of the test drug. Plasma concentrations were measured by using a validated HPLC/MS/MS-assay with limits of quantification of 0.1 µg/L (BAY 38–7268) and 0.5 µg/L (BAY 44–5576), respectively (). Monitoring of safety and tolerability of treatment included subjective parameters like well-being and AEs communicated by the subjects and classified by investigators according to their severity and if AEs were non-serious or serious. Objective parameters were monitored by measurement of heart rate, blood pressure and recording of standard electrocardiogram (ECG). Moreover, blood samples were examined in regard to possible alterations of hematological and clinical chemistry parameters.

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Each of the two treatment periods consisted of one profile day and at 24-hours follow-up examination. Subjects were discharged from the study ward about 1–2 hours after the last examination on days 0 and 1, provided there were no medical objections. There was a wash-out phase of at least one week between each of the two periods. For each subject the study ended with the final examination approximately 1–2 weeks after the second study period. The cheap levitra prices total duration of the study was four months.

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Eye-specific inclusion/exclusion criteria were examined for both eyes. However, only one eye was included for study use. The study was conducted in accordance with the Declaration of Helsinki (1964) in the revised version of 1996 (Somerset West) and 2000 (Edinburgh), the International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use (ICH) GCP Guideline (Note for Guidance on Good Clinical Practice) and the German drug law [Arzneimittelgesetz]. The study protocol was approved by the Ethics Committee of the Medical Faculty, University of Cologne. Subjects must have given their written informed consent to participate in the study after receiving adequate previous information. Moreover, a significant influence of time on the amplitude of the b-wave, 2.4 cds/m2 (P=0.0170) and 5 cds/m2 (P=0.0020), was observed.

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The b-wave amplitude increased with time after administration of active treatment or placebo.

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There were no relevant differences between active and placebo in regard to ERG latency for neither a-wave nor b-wave at any time up to 24 hours after drug administration.

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Other ophthalmological examinations like visual acuity, refraction, intraocular pressure, Humphrey 30-2 visual field test, Amsler grid field test, slit-lamp, and funduscopy did not reveal any significant differences between the two treatment groups (Supplementary materials). It is known from in-vitro studies that PDE-6, which is found predominantly in retinal photoreceptors, is a key enzyme in the phototransduction cascade.Citation15 PDE-6 is required for the transformation of light into electrical signals.

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Quantitative target variables were subjected to an analysis of covariance (ANCOVA) with the factors: treatment, period, subject, sequence, time, and the interactions period*time, treatment*time and the baseline value as a covariate. BAY 38–9456 40 levitra cut price mg (vardenafil hydrochloride) was generally well tolerated. Adverse events were more common in subjects receiving active BAY 38–9456 (vardenafil hydrochloride) when compared to those receiving placebo. The most frequently reported adverse event in each treatment group was “headache”. The intensity of all adverse events was reported as “mild” or “moderate” and the relationship to study drug was “possible” in all cases.

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All adverse events had resolved by the end of the study while there was no evidence for a serious adverse event at any time (). The color discrimination error score of the Farnsworth– Munsell test was the primary variable for the assessment of the visual function. The most pronounced differences between the two treatment groups were observed for total error score 1 and 6 hours after drug administration, and for error score lines 3, and 4 one hour after drug administration, indicating an impairment of color discrimination particularly in representing color vision of blue/green and purple. Minor differences were still present after 6 hours affecting error score lines 1, 3, and 4. There were no differences after levitra 100 mg 24 hours between active and placebo ( and ). For this reason, retinal effects of PDE inhibitors are not unexpected.

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As test drug vardenafil (free base of BAY 38–9456) was administered orally at dosage of two tablets of 20 mg or corresponding placebo. Medication was given once on day 0 (0d 00) of each study period () and in accordance with the randomization list. In order to detect potential ophthalmological changes, BAY 38–9456 (vardenafil hydrochloride) 40 mg was chosen, which was double the expected highest prescribed future dose. A 40 mg dose had previously been found safe in a number of Phase I studies. The amount of dose in the tablet refers to the free base BAY 38–7268 (vardenafil).

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On study days, eye examinations were done in the following order (time needed per examination in brackets; reference is also provided in study flowchart, ): Humphrey 30-2 visual field test (20 minutes) Humphrey 30-2 visual field test (20 minutes) Administration of eye drops for mydriasis and waiting period (30 minutes) Administration of eye drops for mydriasis and waiting period (30 minutes) The color discrimination error score of this test was the primary variable for the assessment of visual function. Total error score was calculated based on the test results for the individual caps. In addition, partial scores (error lines 1–4) were calculated for each of the four boxes of the Farnsworth–Munsell 100 test. According to published data square root of error scores were used to reach a better approximation of the normal distribution.Citation16 Scotopic and photopic ERG measurements were performed according to International Society for Clinical Electrophysiology of Vision (ISCEV) standards.Citation17 ERGs were recorded by Amplaid MK15 evoked potential system (Amplaid USA Inc., Rolling Meadows, IL, USA) connected to corneal jet electrodes. Following dark adaptation of 30 minutes ERGs were recorded according to single flash stimulation with constant luminance stimulus (cds/m2) of 2.4 cds/m2 (no background illumination) and 5.0 cds/m2 (additional background illumination of 20 cd/m2).

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Concentration measurements of BAY 38–7268 and BAY 44–5576 in plasma indicated subject compliance. Moreover, urine probes were taken at baseline to detect possible drug abuse (opiates, amphetamines, barbiturates, cannabis, benzodiazepines, cocaine-metabolites) which would have led to exclusion of the subject. The statistical evaluation was performed using SAS software package (version 6; SAS Institute Inc., Cary, NC, USA). All data were listed and trial summary tables were provided. Exploratory statistical tests were performed to compare the visual function tests following BAY 38–9456 and placebo, respectively. PDE-6 is also weakly inhibited by PDE-5 inhibitors and high plasma concentrations of the latter can be expected to inhibit the phototransduction process in retinal photoreceptors.Citation10 Many investigations have been performed on ocular side effects of

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PDE-5 inhibitors, especially for the use of its best-known representative sildenafil citrate.Citation18–Citation22 In regard to visual function, visual acuity, visual fields, and contrast sensitivity remained unaffected while a temporary impairment of color discrimination represents a definitive effect.

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In comparison to screening ERG with b-wave amplitude of 225±91 µV (2.4 cds/m2), in ERG after 1 hour 20 minutes with active treatment b-wave amplitude was reduced by 15% compared to a reduction of 10% observed with placebo. While there was no relevant difference in b-wave amplitude between the treatment groups after 6 hours 20 minutes, there were again differences between active and placebo after 24 hours (). Compared to a baseline value of 92±41 µV (5 cds/m2), b-wave amplitude was reduced by 27% after 1 hour 20 minutes with active treatment while placebo group showed a reduction of 12%. A less prominent amplitude reduction was still present after 6 hours 20 minutes with active treatment. At 24 hours, the amplitude had nearly returned to baseline values; however, there was still a difference between active and placebo after 24 hours (). Studies on retinal function due to ingestion of sildenafil showed temporary alterations of ERG and color vision correlating with peak plasma concentrations of sildenafil.Citation13,Citation14 Accordingly, in our double-blind, crossover study on ocular side effects of vardenafil hydrochloride, the most pronounced differences between active treatment and placebo in the Farnsworth–Munsell 100 test were observed for total error score 1 and 6 hours after drug administration.

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The findings correlated with BAY 38–7268 and its active metabolite’s plasma concentrations.

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There were no differences after 24 hours between active and placebo.

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The data indicate a mild and transient impairment of color discrimination particularly in representing color vision of blue/green and purple and go along with the results of investigations performed on ocular side effects of sildenafil revealing similar color vision alterations which resolve within 24 hours in correlation with plasma concentrations of the drug.Citation9,Citation11,Citation18 Moreover, ERG measurements showed reductions of the b-wave amplitude with no relevant effects on a-wave amplitude which predominantly recovered after 24 hours.

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