Zhewitra 20 mg has been shown to be effective in helping men with ED achieve and maintain erections sufficient for sexual activity. It can enhance erectile function and improve overall sexual satisfaction. Zhewitra 20 mg should be taken approximately 25 to 60 minutes before anticipated sexual activity. The effects of the medication can last for up to 4 to 5 hours, providing a sufficient window of opportunity for sexual activity. Like other medications containing PDE5 inhibitors, Zhewitra 20 mg requires sexual stimulation to be effective. It does not cause spontaneous erections but enhances the natural response to sexual arousal.