Are you on any BP meds or anti depressants?

If so, you should NOT get the behind the counter stuff.

Talk to the pharmacists.

If you can't swallow pills easily and need a decongestant, Mucinex-D.

If you don't need a decongestant and are just trying to keep the mucus thin so you can clear it, the regular or extra strength.

If you can swallow pills, get your sudafed separately. Drugs have different clearance rates (google them) and you don't always need/want to take both.

In any event: stay hydrated.

Mucinex D. Behind the counter

The one behind the counter. Ask the pharmacist.

I always see this recommended for Covid post-nasal drip. Which one?