APAP ("Tylenol") is always likely going to be in hydrocodone scripts. And yes, PLEASE don't take 50mg at once! Thats is crazy!
My heart rate increases when take hydrocodone (resting heart rate between 100-120 if I take one 7.5/500mg pill) and it was explained to me that hydrocodone sedates (relaxes) your body, making your respirations (breathing) slower. When you breathe slower and more shallow, you don't take the usual amount of oxygen, and so the c02 (carbon dioxide) in your body rises. When we have an increase in c02, our heart rate increases in order to force our blood to shoot around faster in attempt to spread the oxygen around and lower the carbon dioxide.
Rapid heart rate can put you at risk for heart attack, etc. Be careful!
That's a brain full, but hope it helps.
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