"Each tablet, for oral administration, contains 50 mg, 100 mg or 150 mg of Trazodone hydrochloride, USP. In addition, each tablet contains the following inactive ingredients: colloidal silicon dioxide, anhydrous lactose, magnesium stearate, microcrystalline cellulose and sodium starch glycolate." TRAZAMINE (TRAZODONE HYDROCHLORIDE, CHOLINE) KIT [PHYSICIAN THERAPEUTICS LLC]

I like to try and find the inactive ingredients in meds, look them up. I am lactose sensitive, for example, and take my meds that have lactose in them with a "Lactaid" tablet to make sure I don't get side effects from the fillers.

I don't know what might cause the congestion for you from the trazodone, I have congestion nightly when sleeping, some of that is natural I know » Nighttime Nasal Congestion but otherwise, I have allergies/sensitivities and other meds, etc. so figuring it out has gotten a bit more difficult for me. I'd wait a couple weeks like Odee or ask your doctor if you should be concerned, etc.