Use of the long-acting once daily
preparation improves compliance. Nifedipine is a
potent antihypertensive agent but should not be given
sublingually as it may cause a precipitate fall in blood
pressure, which can lead to fetal distress. The concomitant
use of nifedipine and magnesium sulphate must be with
caution due to potential risk of serious adverse maternal
effects such as hypotension.