If you have certain health conditions or are taking certain medications, your doctor may tell you to take sildenafil less often. Would I do it? Taking generic ED medications is an effective way to save money without sacrificing quality. So am I encouraging travelers to come to Greece and use this opportunity to buy their medicine to help defray the cost of their trip? Erectile dysfunction medications require a prescription from a licensed provider.9, posts. 75 reviews. 57 helpful votes. 6. Re: Pharmacy’s. 9 years ago. Save. Pharmacists in Greece are very highly trained professionals and are able to advise on . Still, if your doctor says it’s okay for you to use and you end up paying out-of-pocket, you can still get the generic for a lot less than Viagra. According to price-comparison site .  · Initial dose: 5 or 20 mg orally three times a day, 4 to 6 hours apart. Maximum dose: 20 mg orally three times a day. Injection: Initial dose: or 10 mg IV bolus three times a day. Comments: No greater efficacy was achieved with oral doses higher than the maximum recommended dose.