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Pseudo-ephedrine is a beta (sympathetic) agonist and is very well known to cause palpitation
The blood level of any substance - including drugs - falls to negligible levels (5 % /
In other words only 50% will remain on the end of 1st half life time / At this rate, the reminder on end of 2nd ½-life = 25% / 3rd ½-life = 12.5% / 4th ½-life = 6.25% / 5th ½-life = 3.125% / 6th ½-life = 1.5625% / 7th ½-life = 0.78125 and so on
The half-life of pseudo-ephedrine is 4 to 8 hours / So, by 24 to 48 hours, it will be gone and all will be well.
Wishing speedy recovery