Learn Hardcore Greek: Θα περάσω από το φαρμακείο πριν γυρίσω σπίτι, γιατί χρειάζομαι σιρόπι. - I will stop by the pharmacy before I go back home, because I need syrup.

Yes, περνάω / περνώ often means to pass, but in the expression περνάω από + place, it very often means to stop by or to drop in at a place.

So:

Θα περάσω από το φαρμακείο = I’ll stop by the pharmacy
not just I will pass the pharmacy

This is a very common everyday use of περνάω.

Why is it περάσω and not περνάω after θα?

Because Greek uses aspect very strongly in the future.

θα περάσω = a single, complete action
θα περνάω = a repeated or ongoing action

In this sentence, the speaker means one specific stop at the pharmacy, so Greek uses the perfective form:

θα περάσω

If you said:

Θα περνάω από το φαρμακείο κάθε Δευτέρα

that would mean I’ll be stopping by the pharmacy every Monday.

So περάσω here is the natural choice for a one-time future event.

Why does Greek use από in από το φαρμακείο? Doesn’t usually mean ?