Gewerbesteuer is the municipal trade tax on commercial business activity. The question for a pharmacy is whether adding a service that is not the sale of medicines changes anything about how that activity is classified and assessed.
Gewerbesteuer is the trade tax a municipality levies on a commercial business. Two things get confused in almost every pharmacy discussion of it, so separating them helps. A pharmacy is a regulated healthcare business, but the activity it actually carries on, buying goods and selling them on, is commercial in character and has long been treated that way. Dispensing medicines is not a freiberufliche activity, so a pharmacy does not begin from a protected position that one new service could destroy.
The anxiety about apothekenfremde Leistungen usually comes from somewhere else. A great deal of the advice circulating on this point was written for the liberal professions, for practices whose income genuinely is freiberuflich, where a small commercial share can change how the entire practice is treated. That reasoning is real, but it describes a starting position a pharmacy does not have. Carrying the conclusion across without checking the premise is how an owner ends up worried about the wrong thing, or reassured about the wrong thing.
What matters is narrower and duller, because the answer depends on the individual pharmacy:
Whether a service is billed to the customer as Privatliquidation, remunerated as a pharmazeutische Dienstleistung, or handled some other way changes what those records show. Neighbouring obligations change for the same reason, since a new activity may also be outside the cover of the existing Betriebshaftpflichtversicherung.
None of that can be settled from a glossary entry or a forum thread, because it depends on one pharmacy's structure rather than on the category of service in the abstract. Whether anything changes depends on the legal form and the current assessment of the pharmacy, so it belongs with your Steuerberater before the service starts and not after the first invoice has gone out. The question is cheap to ask in advance and expensive to ask in arrears.
This glossary entry is general information about German pharmacy law and practice. It is not legal advice. For binding guidance on your own pharmacy, contact your Landesapothekerkammer.