Beta blockers (eg propranolol) are used by some to counteract the increase in heart rate and blood pressure associated with stimulant use. However, they are prescription meds and SWIM
would not suggest using them unless advised by a medical professional. Beta Blockers block only the beta adrenergic receptors leaving the alpha receptors available, which could possibly lead to severe negative consequences. Although the mechanism and potential effects aren't widely agreed, theres enough evidence to rule this out without professional advice. Theres an article on Erowid about it called "Interactions between Beta-Blockers and Ephedrine or Amphetamines" which includes the somewhat contradictory quote below:
"... especially in patients without a history of hypertension
. Vasodilators, such as phentolamine, nitroprusside, hydralazine and nifedipine, are the preferred agents for treating ephedra
-associated hypertension.(2,5) B-blockers should not be used alone to treat hypertension because a hypertensive crisis may result from the unopposed effects of the a1-receptors on the vasculature. Tachyarrhythmias are usually responsive to treatment with lidocaine, low-dose propranolol or esmolol.(2,5,14)"
Swim agrees with other responses that your doctor would be best to help you with this.
Take care and good luck.