Usually ok is not sufficient for me. I prefer my medications to come from the manufacturer that is authorized to produce them. I will never chance an unauthorized manufacturer especially after reading what is often found in counterfeit medications. A 20mg pill should have no more, no less than the amount indicated. Sometimes a little weaker is scary as that means there is a likelihood that sometimes the counterfeit drug will be stronger than indicated. There is only ONE online pharmacy overseas that is authorized to sell generic Viagra and they require a prescription.
You are a brave man to use the drugs from these online pharmacies.