Guild of Apothecaries and Physicians
This is one of the richest Guilds in Waterdeep, and has a somewhat checkered history.
On several occasions various of its members have been implicated in smuggling, fraudulent investment affairs, and similar instances of criminally imprudent investments of their monies. No doubt some of their fellows (who have not been caught) remain rich and with shady connections.
This Guild has also been at odds with the Lords as a group. Repeatedly the Guild has tried to have all non-member medical practitioners (including all clerics) banned from practicing in Waterdeep, so that they would have to join the Guild or cease providing it with any competition.
The Lords have strenuously resisted such efforts, executing on two occasions members of this Guild who arranged assassination attempts upon the life of Piergeiron.
The Guild does provide services of high quality, however. It maintains a “Formulary” in its headquarters (open to members only) that records agreed-upon formulae for many drugs and other medicinal remedies, and keeps in stock some of the rarest ingredients needed to make these medicines, dealing with far-faring sea-captains, traveling merchants, and caravan leaders to gain these from the far reaches of the Realms.