Is the powdered Terramycin still effective after it gets damp? I left an opened foil packet outside overnight and the contents got damp from the dew. It's not a solid cake, but it's not powdery either, just sort of clumpy. I don't want to toss it if it's still good since it costs $6 a packet. And especially since I had to buy this because I couldn't find the other THREE packets I've bought previously. But I'd rather buy yet another than treat sick birds with ineffective medicine. Please advise. Thank you.