Hello to you, 1.     I have been taking 20 mg lisinopril prescribed by my GP for two years to control slightly high blood pressure. I am 76 and in good health. 2.     During the last six months I have had both knee joint replaced – rugby injuries of old. 3.     During this period I was prescribed oxycodone as pain relief by the Hospital. 4.     I see an increased heart rate is a common symptom of oxycodone withdrawal. Question;     should I continue, discontinue or even possibly increase the lisisnopril dose rate during the withdrawal period of perhaps 7 days . At present the principal withdrawal symptom is complete lack of energy/lassitude and the need to rest in bed every few hours. Warm regards, Stephen Gibbs-Sier