I am not a medical professional, but have been using it for two years. I used it under medical advice, not for being harder, but out of medical necessity (it’s not a shameful thing to admit).

Those side effect did happen to me when I first started it out, but over time would die down. Don’t worry too much; but I wouldn’t recommend you driving if you are still having these effects, it’s a irresponsible thing to do.

If these effects persisted, stop using.