Pharmacies are among the easiest services to find in most countries: they cluster on shopping streets, in malls and supermarkets, near hospitals and clinics, and around transit stations, usually marked by a recognizable symbol like a green cross or a local equivalent worth learning on day one. In many countries chain pharmacies and convenience-store pharmacy counters make them nearly as common as coffee shops.
Hours follow local retail rhythms, typically daytime into early evening, with shorter weekend hours, though malls keep theirs open later. For after-hours needs, most major cities have some system: dedicated 24-hour pharmacies, hospital pharmacies attached to emergency departments that dispense around the clock, or a rotating duty pharmacy scheme where one pharmacy per district stays open each night, with the roster posted on every pharmacy's door and online.
Map apps handle the finding part well; searching pharmacy plus open now is usually accurate.