[sdbrown]

That doesn't change the difference between effective and toxic doses, it changes the potential scale of off-by-one user error. If 20 milligrams is delivered in 1 tablet, then 3 tablets is the toxic dose. If 20 milligrams is delivered in 5 tablets, then 15 is the toxic dose. A single daily tablet is far superior to multiple daily tablets in terms of patient adherence and hence disease management.

Can you name specific examples where the number of pills/capsules/tablets has been increased to improve drug safety? Increased pill counts historically reduces patient adherence, which worses disease management. This is just the first example I found which measured it: https://pubmed.ncbi.nlm.nih.gov/31298592/ This review explicitly states it in the abstract even: https://pubmed.ncbi.nlm.nih.gov/30561486/

[JumpCrisscross]

Idk what to say, this is established medicine [1]. When you have a small TI you dilute to make measurement tolerances wider in absolute terms. This is a motivating factor behind prescription-strength medicine.

> Increased pill counts historically reduces patient adherence

Of course. There are tradeoffs. You want to know what also increases burden? Requiring a prescription.

[1] https://en.m.wikipedia.org/wiki/Therapeutic_index

[sdbrown]

I don't see dilution anywhere on that page, and increasing volume of administration at a lower concentration to achieve the same effective dose does not alter the dose itself. You are not interpreting TI correctly.

Edit: further, to your comment about "prescription strength" nomenclature, look at section 14 of the Cialis/tadalafil prescribing information, IIRC, table of clinical studies, where they have the second two outcomes of the clinical studies broken down by dose. Efficacy increases pretty directly with increasing dose, and these are where the observed side effects show up. It seems like patients may well self-escalate. Maybe the OTC countries have public data on this?