Should i take medication for sinus tachycardia if my heart rate for example during climbing stairs is 151 and when i am in stress it is 136 ?

Depends : Whether one needs medicine for sinus tachycardia depends on whether one has any underlying structural or functional heart disease. It also depends on the resting heart rate and whether someone is taking substances that can increase heart rate such as caffeine products or decongestants. It could also depend on whether one is symptomatic. Most cardiologists would do a stress echo and good history.