"This speculation about the safety of ACE-i or ARB treatment in relation to COVID-19 does not have a sound scientific basis or evidence to support it. Indeed, there is evidence from studies in animals suggesting that these medications might be rather protective against serious lung complications in patients with COVID-19 infection, but to date there is no data in humans.

The Council on Hypertension of the European Society of Cardiology wish to highlight the lack of any evidence supporting harmful effect of ACE-I and ARB in the context of the pandemic COVID-19 outbreak.

The Council on Hypertension strongly recommend that physicians and patients should continue treatment with their usual anti-hypertensive therapy because there is no clinical or scientific evidence to suggest that treatment with ACEi or ARBs should be discontinued because of the Covid-19 infection. " [1]

There are also the brilliant MedCram updates, where the issue of ace inhibitors et. al just happened to be discussed yesterday. In it he describes the mechanics of ACE-i and ARB treatment: https://www.youtube.com/watch?v=1vZDVbqRhyM

[1] https://www.escardio.org/Councils/Council-on-Hypertension-(C...