Letter: Guanethidine in hypertension.
D004359:Drug Therapy, Combination; D006145:Guanethidine / Q000009:adverse effects*; D006801:Humans; D006973:Hypertension / Q000188:drug therapy*; D010096:Oxprenolol / Q000627:therapeutic use
D010096:Oxprenolol; D006145:Guanethidine