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The mean values of choroidal thickness, as recorded in all three quadrants for each eye separately in group A before and after the consumption of sildenafil citrate are presented in Table 1 and Figures 2 and 3.

2.6 Use in Specific Populations

The subjects were not repositioned nor the instrument realigned during the whole scanning procedure, in order to keep the measurement conditions as constant as possible. Before examination, the pupils were dilated with drops containing 0.5% tropicamide and 2.5% phenylephrine. The images of the choroid were acquired based on the enhanced depth imaging (EDI) OCT method, as already described by Margolis and Spaide [14]. The instrument was placed close enough to the eye to obtain inverted images, which were averaged using the automatic averaging and eye tracking features. Seven sections, each comprised of the 100 averaged scans, were obtained in a 5 × 30 degree rectangle encompassing the macula and optic nerve, and the horizontal section going directly through the center of the fovea was selected.

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Choroidal thickness (CT) was determined as the distance from the outer surface of the hyper-reflective line, referred to as the RPE layer, to the hyper-reflective line of the inner sclera border. The choroidal thickness in areas of temporal, nasal and inferior quadrants was recorded. The resolution of the CT image is impaired in highly myopic elongated eyes and poorly fixating patients. All CT measurements were performed by the same well-trained and experienced operator at baseline and two hours after the consumption of sildenafil citrate or tadalafil. The statistical program IBM SPSS Statistics 22.0 was used for the data analysis. The mean choroidal thickness in Group A was significantly increased in each quadrant after the intake of sildenafil (Table 2).

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Assessing each eye separately, significant raises in choroidal thickness were also noted in all areas (Table 3).

• Generic tadalafil became available after Lilly's patent expired.
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Table 1: Choroidal thickness (CT) in all quadrants of the right (RE) and left (LE) eye, separately, in group A, before and after the consumption of sildenafil citrate. Table 2: Assessing the significance of increase in choroidal thickness (CT) in three quadrants, which is noted after each PDE-5 inhibitor intake within each group.

5.9 Alcohol

The maximum concentrations of tadalafil are observed between 30min and 6 hours and it has a longer half-life of 17.5 hours, compared to sildenafil. Tadalafil is 700-fold and 9000-fold more potent for PDE5 than PDE6 and rest PDE, respectively, justifying the eliminated visual disturbances. PDE inhibitors used in erectile dysfunction have been implicated in ocular side effects, including changes in color vision and light perception, blurred vision (central haze, transitory lower vision), transient alterations in electroretinogram (ERG), conjunctival hyperemia, ocular pain and photophobia [6]. Moreover, tadalafil administration has been also associated with the development of thickened and markedly hyper-reflective areas in the photoreceptors' internal-outer segment (IS-OS) interface, being accompanied with a serous retinal detachment-like appearance [11]. Both sildenafil and tadalafil have been related to central serous chorioretinopathy (CSC), which recedes after the discontinuation of the medication [12,13].

Frequently asked questions

The aim of the present study was to demonstrate anatomic and physiologic changes in the human choroid following systemic sildenafil and tadalafil, using enhanced depth imaging (EDI) optical coherence tomography (OCT). This the first time in literature that the impact of tadalafil on chorioretinal vascular permeability and choroidal thickness is investigated. Twenty young and healthy men participated in this cross-sectional randomized study, which was conducted at the 1st University Eye Clinic of General Hospital of Athens G. Gennimatas. All participants underwent an OCT measurement of choroidal thickness, which was repeated two hours after the consumption of a PDE-5 inhibitor. Table 3: The significance of increase in choroidal thickness (CT), which follows the PDE-5 inhibitor administration, for each eye separately, between the two groups.

• Lifestyle factors can influence the effectiveness of Cialis.
• Maintaining a healthy weight and exercising can improve ED.
• Smoking cessation and reducing alcohol intake are beneficial.
• Managing stress, anxiety, and underlying health conditions is important.
• A high-fat meal may delay the onset of the "as-needed" dose slightly.
• The daily dose is less affected by dietary timing.
• Overall cardiovascular health is closely linked to erectile function.

The mean values of choroidal thickness for each eye separately in group B, before and after the consumption of tadalafil, are presented in Table 4 and Figures 5 and 6.

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The mean choroidal thickness in Group B was significantly increased in each quadrant after the intake of tadalafil (Table 2).

5.14 Consideration of Other Urological Conditions Prior to Initiating Treatment for BPH

Conclusion: Both sildenafil and tadalafil resulted in the increment of choroidal thickness, but tadalafil caused a lower increase. This alteration could secondary affect retinal function or be a useful adjunct whenever increase choroidal blood flow is demanded. Keywords: Choroidal thickness; Enhanced depth imaging optical coherence tomography; Erectile dysfunction; Pathophysiology; Phosphodiesterase type 5 inhibitors; Sildenafil; Tadalafil Erectile dysfunction, which is defined as the persistent inability to achieve or maintain an erection sufficient for satisfactory sexual performance, is estimated to affect up to 30 million men in the United States, ranging from cialis 10mg tablet 39% around 40 years to 67% among men 70 years old [1,2]. The first line treatment of erectile dysfunction mainly concerns phosphodiesterase type 5 (PDE5) inhibitors, which include Sildenafil citrate (Viagra; Pfizer, Inc, New York, NY), longer active Tadalafil (Cialis; Lily ICOS LLC, Indianapolis, Ind), Vardenafil hydrochloride (Levitra; Bayer AG, Leverkusen, Germany, and GlaxoSmithKline, Uxbridge, England), and Avanafil (Stendra; Vivus, Mountain View, CA). Mammalian 3?,5?-cyclic nucleotide phosphodiesterases (PDEs), which are classified into 11 families (PDE1-11), are responsible for the degradation of cyclic nucleotides.

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The latter regulate the contraction and relaxation of vascular smooth muscle [3]. PDE5, which is a cytosolic enzyme, is expressed in smooth and cardiac muscle, platelets, and retina along with PDE2, PDE6 and PDE9 isoforms. Sildenafil is a very potent inhibitor of PDE-5 and of PDE-6 (10-fold less potent than on PDE5), resulting in the elimination of cGMP in cavernosal smooth-muscle cells, in smooth muscle relaxation and penile erection. Its maximal levels are achieved within 0.5-2 hours after oral ingestion and its mean terminal half-life is 3-5 hours [2,7-9]. The most common adverse effects of sildenafil are strongly associated with the suspension of PDE5 (headache, nasal congestion, flushing, and dyspepsia), of PDE6 (visual disturbances) and of PDE3 (hypotensive effect) isoforms [2,6]. Table 4: Choroidal thickness (CT) in all quadrants of the right (RE) and left (LE) eye, separately, in group B, before and after the consumption of tadalafil.

5.6 Alpha-blockers and Antihypertensives

Descriptive analysis was carried out for age and choroidal thickness values; the latter were charted in box plots. Non-parametric analysis Kolmogorov-Smirnov was used to check the normal distribution of the variables. The paired two-tailed t-test was utilized to calculate the differences in means of choroidal thickness between baseline values and those after the consumption of the PDE-5 inhibitor within each group. If the data failed the normality test, the non-parametric Wilcoxon matched-pairs signed-rank test was used. Independent samples t-test and Mann-Whitney test were applied to identify the possible differences in means of choroidal thickness between two groups (Mann-Whitney test was used when there was no indication of normal distribution either after Kolmogorov-Smirnov analysis or after Levene's test for equality of variances).

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A p value less than 0.05 was considered to indicate statistical significance. Twenty young and healthy individuals were recruited in this study. The mean age super cialis of participants was 34.2 ± 3.0 and 34.6 ± 3.2 years in group A and B, respectively. The distribution of age was normal among participants, according to Kolmogorov-Smirnov test. There were no differences in distribution of age between the groups (independent samples t-test: t(18)=-0.291, p=0.774, Levene's test: p=1.000). Comparison of sildenafil and tadalafil effects on participants Assessing the mean choroidal thickness (CT) of the participants at baseline, no statistical significant differences were observed between the two groups (independent samples t-test, CT temporal: t(18)=-0.124, p=0.903, Levene's test: p=0.935, CT nasal: t(18)=0.511, p=0.616, Levene's test: p=0.473, Mann-Whitney test, CT inferior: p=0.912).

12.1 Mechanism of Action

The participants were randomly classified in two groups; group A included ten individuals who received 50 mg of Sildenafil citrate (Viagra; Pfizer, Inc, New York, NY) and group B included ten individuals who received 10mg of Tadalafil (Cialis; Lily ICOS LLC, Indianapolis, Ind). The doses were adjusted to the recommended ones, which are 50 mg (maximum 100 mg) for sildenafil and 10mg (maximum 20 mg) for tadalafil [6,7]. We decided to administer the most commonly prescribed medications for erectile dysfunction in the dosage that they are usually received by the patients. Subjects were instructed to retrain from eating for at least four hours prior to the study. The exclusion criteria were a history of any ocular or systemic disease such as retinal, choroidal or cardiovascular pathology and refractive errors >-5D.

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The study was performed in accordance to the tenets of the Declaration of Helsinki and the protocol used was approved by the ethics committee of the University Hospital. Written informed consent was obtained from all participants. Choroidal thickness records were based on Heidelberg Spectralis (Spectralis HRA+OCT, Heidelberg Engineering, Heidelberg, Germany). This device combines a spectral domain OCT and a confocal scanning laser ophthalmoscope in a single instrument. The acquisition rate of the Spectralis OCT is 40,000 A-scans per second. Similarly, the mean choroidal thickness of each eye separately appeared no statistical significant differences between the two groups at baseline (Table 5).

• The standard "as-needed" doses are 10 mg or 20 mg taken before activity.
• The 20 mg dose is the maximum recommended for on-demand use.
• It should be taken at least 30 minutes prior to sexual activity.
• Efficacy can be expected for up to 36 hours after a single dose.
• The daily dose for ED or BPH is lower, usually 2.5 mg or 5 mg.
• Missed daily doses should be taken as soon as remembered.
• Do not take more than one dose in a 24-hour period.

On the other hand, the mean choroidal thickness after the consumption of sildenafil or tadalafil was statistically different between the two groups (Mann-Whitney test, CT temporal: p=0.005, independent samples t-test, CT nasal: t(18)=2.647, p=0.016, Levene's test: p=0.321, CT inferior: t(18)=2.018, p=0.059, Levene's test: p=0.232).