152-11-4, 52-53-9 (verapamil). 33286-22-5, 42399-41-7 (diltiazem). 4205-90-7, 4205-91-8, 57066-25-8 (clonidine). 555-29-3, 555-30-6 (methyldopa)

Maxwell, Colleen J., Hogan, David B., Hirdes, John P. 2000. The prevalence and treatment of hypertension in long-term care settings: Implications for quality of care of the frail elderly. Annals of Long Term Care. 8 (11) 31-36.