Re: Medrol pack for Sinus pain/pressure
How long it will last really depends on what's causing your sinus pressure. If the pressure is caused by allergic inflammation, the effects of the Medrol dose pack may only last a few weeks (unless you get your allergies under control). If the inflammation is caused by something else you may get relief for much longer.
Unfortunately, sinus inflammation and pressure can be a pain to treat if the underlying cause isn't treated (or managed). Hopefully your doctor has some idea of what's causing the inflammation and you have a plan for keeping it under control with saline irrigation, steroid sprays, allergy treatment, etc.