Most regular medications are continued on admission unless there is good reason for suspension.
Antihypertensives
Beta-blockade
Abrupt withdrawal of β-blockers can produce rebound hypertension. The author believes, and is somewhat supported by evidence 1
RAS blockade
Guidelines abound, but none are particularly helpful. RAS inhibitors should probably be withheld in unwell patients at risk of AKI or those that are hypovolaemic.
The onset of action of most ACE inhibitors and ARBs is at least a couple of hours. In the setting of hypotension (systolic below 90-100mmHg) withholding the drug is reasonable, though it is unlikely cause profound hypotension.
Calcium channel blockade
Further reading
Footnotes
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Pucci G, Ranalli MG, Battista F, Schillaci G. Effects of β-Blockers With and Without Vasodilating Properties on Central Blood Pressure: Systematic Review and Meta-Analysis of Randomized Trials in Hypertension. Hypertension. 2016 Feb;67(2):316–24. ↩