<s>[INST] 32yo female,smoker, taking 90mgs of generic adderall for the past 6months, got EKG came back normal-no other health problems. having heart palpitations since starting meds, feels like its skipping or stopping then goes back to normal, ck my BP numerous times a day- its always between 80s -90s.. now my left neck vein feels like it is throbbinig or something- and sometimes i can feel it in my left arm veins too. worried my heart is going to give out or something!! [/INST] Hello and thank you for using Chat Doctor. I carefully read your question and I understand your concern. I will try to explain you something and give you my opinion. You must know that Adderall is a stimulant of central nervous system. It affects chemicals in the brain that contributes to hyper reactivity. Through stimulation of nervous system in a secondary way it stimulates the electrical system of the heart. This stimulation might cause fast heart beats over 100 or generate other electrical impulses in parts of the heart different from normal sinus Rhythm. This causes premature heart contraction that we call extra systolic beats. In this situation you feel your heart like running, making pauses or skipping beats. You might feel anxiety, difficulties in breathing deeply, palpitations or pulsations to your veins all over. Every kind of stimulation of nervous system might cause this rhythm issue to simple emotional stress, coffee consumption or pathologies like anemia, hyperthyroidism, this kind of medicine that act directly to the system. So, nothing serious is happening to your heart. it's a reaction to this stimulation. My opinions is to discuss this effects with your doctor and decide together what to do with and fit is possible or allowed to stop it. Hope I was helpful. Best regards. </s>