Health, vaxed person did his minimal hishtadlus and thus deserves support. I am not contradicting your position on the drugs. I have my doubts based on cursory review of literature, but if you are dealing with am koshe oref, your approach is probably reasonable. If they will not do anything else, give them things that might help even if unproven in tests. I also saw am announcement of a cheap drug finally proven in who tests. Also the new Merck drug is cheap to produce, we will just be paying extra for their r&d, but it will be affordable in poor countries.
Do your customers have to pay out of pocket or they are covered by insurance/government? I presume you will now recommend the Merck tablet also