Bad idea overall...
Here's why you can't:
1) it's not worth it, so it's infeasible.
2) it's a pill so it's not ready to be shot...
3) without the proper equipment (micron filters, luer lock syringes and tips, bacteriostatic water, etc.) you can forget about shooting pills in a "safe" manner.
Please examine why by using the search engine to find these threads:
Inactive Ingredients A to Z
Micron Filtering Mega Thread
The second one is the last link in my signature, and it will hold a lot of information for you.
Finally, trazodone isn't a drug you want to be taking anyways, it is not at all recreational or enjoyable in my experience.
Last but not least, we frown on when people go "well how about this, can I shoot it?" because if you're asking that question, you likely have a lot left to learn.
I am gong to close this thread, please look up the necessary info before even attempting something so foolish and risky as this.