I'm gonna give Spikes the benefit of the doubt here and take his press release for face value. I'm sure the NFL is like other leagues where there are a variety of banned medications that run the gauntlet of practical uses. Heck, I'm pretty sure Sudafed is banned in most leagues. Could simply be a screw up on his part.
If it happens again with him or something else comes to light, then I'll feel differently about the kid. But for now, I'll let it pass. He's a rookie after all.