South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde
After 24 moderately severe hypertensive patients had been treated for 4 weeks with a placebo for timolol, alpha-methyldopa was added and titrated until control of the blood pressure or a total daily dose of 2 500 mg was achieved. At the 9th week, the dose of alpha-methyldopa was halved and either timolol or its placebo was titrated in double-blind fashion. Titration over a period of 4 weeks was followed by a further 5 weeks of stabilisation. In 22 patients whose responses were accepted for analysis, alpha-methyldopa caused a significant lowering of blood pressure, with a greater reduction in the upright posture and a reduction in pulse rate. The addition of timolol caused a highly significant further reduction in pulse rate and a significant reduction in blood pressure in 8 of 10 patients. Apart from a statistically significant increase in serum urea and creatinine with, however, retention of normal renal function, no other side-effects were attributable to timolol.