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Except for increased error scores in color discrimination tests (assessed by means of Farnsworth-Munsell 100 Hue test) reported for sildenafil 100 mg, one hour and two hours post-dose, no specific effects on visual function were seen at the therapeutic dosages.These studies have demonstrated that sildenafil has vasodilator properties which can, at higher doses, be associated with reductions in blood pressure and accompanied by an indirect increase in heart rate. cialis without doctor’s prescriptiion.