"Today I decided to use one of the 4 or 5 Kick tablets I had left."
This leads me to believer that you've used it before, and with no mention of a similar problem. IIRC, standard packaging is 10 tablets, so maybe several previous uses.
Either way, "the most likely suspect", is subjective and not a good substitute for evidence. As I said, Laying the blame on a product is just an easy out.