The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire. Headaches One of the most commonly reported side effects of generic Viagra is headaches. We also looked at additional services, such as access to digital pharmacies and home delivery options. Therefore, it’s important for users to engage in foreplay or other forms of sexual stimulation for generic Viagra to be effective. Alcohol and Grapefruit Juice Consumption When using generic Viagra, it is advisable to avoid consuming excessive amounts of alcohol or grapefruit juice.Viagra and similar medications are useful for improving sexual function in men with ED. But some men without ED use these medications without a prescription or off-label to try to improve sexual performance. You shouldn’t take Viagra or medications like it without a prescription. In fact, in some countries, generic Viagra is available without a prescription, making it even more accessible to those in need. Generic viagra is available in various strengths, including 25mg, 50mg, and mg. Generic viagra has been found to be effective in approximately % of men with ED. Best Low Cost: GoodRx Fastest Delivery: Blink Health: Sesame Sign Up Now Key Specs Cost: Consultation prices vary based on the prescriber; $5 generic prescriptions Medical Consultation Required: Yes Medications Prescribed: Viagra, Cialis, sildenafil, tadalafil Generic offered: Yes Why We Chose It.