The Doctrine of pith and substance is an old concept, borrowed by Indian Constitutional makers from the ‘Canadian Constitution’. The word ‘pith’ denotes ‘true character or essence’ and ‘substance’ denotes ‘the most significant part of a thing’. Hence, this doctrine aims to find out the true nature of a statute.
The current emergent pandemic is extraordinary and certainly call for diverse actions but the practicability of putting an absolute embargo on the legal standards of medical practice don't seem to be justified. The solution may lie in a separate set of directives being issued in light of the prevalent situation so as to balance the interests of the patients, doctors and other stakeholders.
An outright ban would defeat the purpose of a ban as it would only create a black market which is more harmful in the long term. However, regulation and taxation could be a solution to reduce the consumer base until scientific evidences prove their health risk,