I have been purchasing Stronghold/Revolution for my dog from PetBucket for about 5 years.  My dog has never had a flea on him.  The medicine is supposed to prevent heartworms too, so to be sure it is working I had him tested for heartworms at his annual check-up and he is negative.  So, this medicine is real/it works.  I'm in the US and I receive it in about 14 days.  I am so happy that PetBucket is in business because I save a lot of money and my dog gets good medicine.  I also have recommended PetBucket to my friends.