Understanding Sildenafil Citrate

[1]Instruct the patient to seek medical attention

Adult Indications and Dosage

[1][212][241] In one study in healthy men, concomitant use of bosentan (125 mg twice daily) and sildenafil at a dose not approved for the treatment of erectile dysfunction (80 mg 3 times daily) resulted in a 63% decrease in AUC and a 55% decrease in peak plasma concentrations of sildenafil at steady state; AUC and peak plasma concentrations of bosentan were increased by 50 and 42%, respectively. [1][241] The clinical importance of this pharmacokinetic interaction is unclear. Concomitant administration of sildenafil and heparin in rabbits had an additive effect on bleeding time. [1] Although the possibility of a similar interaction in humans has not been studied specifically to date, there currently is no evidence that would preclude the use of heparin in sildenafil-treated patients if indicated. Pretreatment with erythromycin (500 mg twice daily for 5 days), a specific CYP3A4 inhibitor, increased the AUC of a single 100-mg dose of sildenafil by 182%.

Can you take Viagra if you have high blood pressure?

[1][69][239] It is recommended that a lower initial sildenafil dose (25 mg) be considered in patients with ED receiving potent CYP3A4 inhibitors such as erythromycin. No pharmacokinetic interaction has been observed to date between azithromycin (500 mg daily for 3 days) and sildenafil. [1][138][239] Therefore, no dosage adjustments are required in patients receiving these drugs concomitantly. In a clinical trial combining a single dose of sildenafil (50 mg) and aspirin (150 mg), sildenafil did not potentiate the aspirin-induced increase in bleeding time. In an in vitro human platelet study, sildenafil potentiated the antiaggregatory effect of sodium nitroprusside.

Dosage for erectile dysfunction (ED)

The possibility that concomitant administration of rifampin, a potent CYP3A4 inducer, could decrease plasma concentrations of sildenafil should be considered. Additive hypotensive effects can occur if riociguat is used concomitantly with PDE type 5 inhibitors. [1][247] In a study in patients with pulmonary arterial hypertension (PAH) who were receiving stable dosages of sildenafil (20 mg 3 times daily), administration of single doses of riociguat resulted in additive hemodynamic effects. [247] A high rate of drug discontinuance generally has been observed among patients receiving combination therapy with sildenafil and riociguat; at least one death, possibly related to the combined use of these drugs, has been reported. Because of the risk of hypotension, concomitant use of sildenafil and riociguat is contraindicated. immediately if they take too much sildenafil.