Do you have a purrscription?

You've been sick for about a week now. Desperate to feel better, you browse your local pharmacy for something, anything that could provide some relief for your symptoms. A bottle falls off the shelf behind you. You turn your head, and you see a paw retract between the boxes. As you get closer to investigate, two bright eyes glint in the darkness. Suddenly, a cat appears behind the boxes, and you could swear it nods at you. Instantly, your sinuses clear, your cough stops, and the fog is lifted from your mind. You blink in astonishment. The cat blinks in contentment, then retreats to the darkness, leaving you with the bottle in your hand. The bottle reads: Meow.