There is potential for interaction, so they were prescribed to you in careful amounts. Disrupting that is asking for trouble, in the most extreme form, serotonin syndrome, although you would have to take quite more than you are speaking of here probably to be in that territory, but if you're adding a third antidepressant (well, presuming trazodone is for sleep and tramadol is for pain, maybe the first antidepressant) in sertraline, well, it is not a combination I would be comfortable with, especially tampering the doses.
There is no possible reason for you to want to snort these pills, though. Tramadol's oral bioavailability is just fine, and taking it through other routes will increase your risk of seizures (although at such a low dose it is not a major concern, but I somewhat suspect you're wanting to take more.) Snorting trazodone is just dumb.
More surface area will not mean more absorption, the capsules are designed to give good absorption. Both drugs are water soluble so you could just dissolve them and drink them down, this may hit you a bit quicker (as in a few minutes quicker, totally insignificant and not worth the bother), but not any stronger. It's not worth the effort. Just take the drugs as prescribed. I assume you are wanting to get high off the tramadol? Tramadol is not a very good opiate, anyway, except for it's tricyclic-antidepressant-like effects which can be good for certain types of pain, but in combination with everything else, escalating the dose, which you would no doubt have to do to get enjoyable effects, is a recipe for seizures, and possibly serotonin syndrome. All in all a waste of drugs and a bad idea.
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