Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

339 questions · 346 findings · 42 reviews · Headline outcomes only

No studies found 74 · 21.4%GRADE not reported 8 · 2.3%Very low 72 · 20.8%Low 107 · 30.9%Moderate 68 · 19.7%High 17 · 4.9%

First‐line thiazides vs calcium channel blockers

Adverse effects (side effects; treatment withdrawals) · patients with hypertension

First‐line thiazides may leads to lower withdrawals due to adverse effects Duration: 1 to 5 years compared with first‐line calcium channel blockers (low certainty).

1 finding from 1 review

First‐line thiazides vs calcium channel blockers

Total serious adverse events Duration: 1.75 to 3 years · patients with hypertension

First‐line thiazides showed no clear difference in total serious adverse events Duration: 1.75 to 3 years compared with first‐line calcium channel blockers (low certainty).

1 finding from 1 review