I just ordered Frontline Plus for Cats from this site. After waiting I got a package from the UK... NOT the US but the UK... The packaging is totally different then what we get here in the US... and it DOES have an expiration date not to mention other differences. I contacted OKPET.com and was told it was shipped from the UK and that is fine for our use. I called Merial who manufacturers Frontline Products and I was told NOT to use this product that it is NOT approved by the FDA here in the US... They explained that the drugs in the UK are different then what we need here and what has been approve here. Merial is replacing my Frontline but they also stated that OKPETS is NOT approved to sell this item in the US... I called OK Pets again and once again got the run around that they are a licensed pharmacy and that it is ok for them to sell this product... Sorry but I myself will take the word of the manufacturer over this website!