A prescription drug called Silagra 100 is used to treat impotence, or erectile dysfunction, in men. It functions by boosting penile blood flow. While undergoing treatment, try to avoid or consume alcohol in moderation as it can cause vertigo. You can take Silagra 100 with food or without any food. It must be taken exactly as prescribed by your physician. The recommended amount of time to wait before having sex is one hour. It must be taken no more than once a day. Take it all in at once. Never shatter, eat, or crush it. You can take Silagra 100 with or without food, although taking it at a set time is recommended.