That's what the practice manager at my vets told me about most meds - creams can become contaminated but it is unlikely. Hope he's feeling better today. As well as Willow's constant runny eye, both Kylie and Alice get little flare-ups of watery eye which seems to go by itself. The vet said if the discharge is cloudy, there could be infection but if it is clear, it should be fine.
One thing I don't understand is Willow's runny eyes are a reddish liquid but with Alice & Kylie, it is clear - I though cats tears were red?