Does " before discharge" mean "leaving hospital"?

Or "going out of hospital"?

Context:

In our practice, in the absence of contraindications, we empirically recommend chronic ß-blocker therapy with
the aim of reducing the likelihood of a recurrent episode.Initiation of angiotensin-converting enzyme inhibitor or
angiotensin receptor blocker therapy before discharge is reasonable. This is particularly important because the
diagnosis may not be certain at the time of discharge and these drugs would be indicated for nonreversible left
ventricular dysfunction. Inhibitors of the renin angiotensin system can be discontinued once there is complete
recovery of systolic function in ABS. Annual clinical follow-up is advisable because the natural history of ABS
remains unknown.