Calcium channel blockers showed no clear difference in acute rejection compared with placebo/no treatment (low certainty).
Calcium channel blockers showed no clear difference in withdrawal due to side effects compared with placebo/no treatment (low certainty).
It is very uncertain whether summary of findings: Calcium changes death (all causes) compared with placebo/usual care (very low certainty).
The review found no eligible studies for this question.
Summary of findings: Calcium may leads to higher hypercalcaemia compared with placebo/usual care (low certainty).
Summary of findings: Calcium showed no clear difference in nausea compared with placebo/usual care (low certainty).
The review found no eligible studies for this question.
It is very uncertain whether summary of findings: Calcium changes constipation compared with placebo/usual care (very low certainty).
First‐line calcium channel blocker showed no clear difference in total mortality compared with placebo (low certainty).
First‐line calcium channel blocker may leads to lower total stroke compared with placebo (low certainty).
First‐line calcium channel blocker showed no clear difference in total coronary heart disease (CHD) compared with placebo (low certainty).
First‐line calcium channel blocker may leads to lower total cardiovascular events compared with placebo (low certainty).
The review found no eligible studies for this question.
Vitamin D + calcium supplementation may leads to higher preterm birth (less than 37 weeks' gestation) compared with placebo or no intervention (low certainty).
It is very uncertain whether vitamin D + calcium supplementation changes low birthweight (less than 2500 g) compared with placebo or no intervention (very low certainty).
Vitamin D + calcium supplementation probably leads to lower pre‐eclampsia compared with placebo or no intervention (moderate certainty).