I took a chance with "generic" cialis from India. The shipment took about 3 weeks from the time ordered, which isn't too bad when coming from overseas. The medication arrived and I started on it (changed from Eli Lilly product). I was unsure if it was working due to having had a prostate biopsy. So...I sent one of the little blue pills to a lab for a quantitative analysis of tadalafil. The lab result were 5mg tadalafil, as ordered. The cost was a fraction of the non-generic cialis. The customer service was excellent and polite as well. Wow!