With this in mind and by determining the type of hypertension with a hour blood pressure monitoring ABPMindividual chronopharmacological chronopharmacotherapy treatment can be planned.
There are significant differences in the chronokinetics of antihypertensive drugs administered at different times. Their therapeutic range and efficacy depend significantly on their circadian timing.
Although the most modern antihypertensives have a hour effect, they are not able to lower blood pressure at all times.
Morning intake of ACE inhibitors, ARB-s, alpha-blockers mainly affect the afternoon and early evening rise, while evening intake reduces nocturnal and morning rise. Calcium channel blockers, beta-blockers except carvedilol and labetololdo not affect the circadian blood pressure profile.
Therefore, in nondipper hypertension or in the case of morning rise, the twice daily morning and evening administration is more effective than the single morning administration. Usually a lower dose is sufficient in the evening.
Adequate control of nocturnal or morning blood pressure elevations can be achieved with medication taken in the evening. According to the relevant studies the conclusion is that there is no convincing evidence that the administration of BP-lowering drugs in the evening provides any significant advantage in terms of quality of BP control, prevention of target organ damage or reduction of cardiovascular events, so evening intake only is not recommended.
In particular the administration of antihypertensive drugs at bedtime, especially in the case of elderly patients may cause excessive BP fall at night with increased risk of silent cerebral infarct and the myocardial ischemia in patients with coronary heart disease.