Earlier quoted context omitted.
I haven't tried lately (moved on to aother anti-histimines) but with a Driver's license, I could pretty readily get ahold of it. Then had to disengage based on what it was doing to my blood pressure.
Were you using a ‘D’ version? Like Claritin-D? I got that by accident once and my heart pounded like I was on speed. I’m highly sensitive to that stuff, same at the dentist the local anesthesia makes my heart race. Third generation antihistamines are amazing. Zyrtec changed my life. I used to majorly struggle with ‘hayfever’ as we called it, to the point it ruined my summer. I was miserable as a child, only winter ga…
Pseudoephedrine literally is an amphetamine, and famously the precursor to meth(amphetamine). I don't have a similar reaction but I'm not surprised some people are more sensitive.