hmm this is interesting,
i highly doubt they would do this,
maybe they could of switched the wrong medicine's by accident,but even that is rare/almost impossible.
if you're acually worried,bring it to a different pharmacist,or the same one while different people are working,or you can even bring it to your doctor.
ask them to check it,say you think you've got the wrong pills or medicine/or you think there's something wrong with it(dont say bottle of poison lol )
then they'll check it out or w.e and call you,
dont take it til you get it done,
unless you feel you were misjudged the first time