Independent online pharmacies operate solely on the Internet, either domestically or internationally. However, others work on a cash-pay basis and don’t partner with insurance companies. It depends on the platform and insurance provider. Please expect up to 4 to 6 weeks for reimbursement. There are many safe, reliable online services offering ED prescriptions. It’s available in 10 mg and 20 mg tablets.Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online. Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat pulmonary arterial hypertension, a serious heart and lung condition. This drug is more popular than comparable drugs. It is available in generic and brand versions. Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in adult males* with ED. With ED, you.