I have been taking vyvanse for the past week (switched from concerta to vyvanse due to bad withdrawals) I just stopped taking vyvanse today, as my withdrawals have become worse (shortness of breath, can t keep my eyes open, muscle jerking and verbal tics) Any way, it s seems if my rectal bleeding started a few days after starting vyvanse. I ve had anal fissures b4, but not sure if there may be another reason for the bleeding that may have been caused by vyvance?