...At V & V Tack and Feed in Las Vegas, store associates like Shelly Smith are asking customers who are interested in purchasing the drug to show a photograph of the horse they own... ...Smith also said that she encountered a customer who was looking for the dewormer. The man had been taking Ivermectin for numerous weeks despite being warned repeatedly about the possible side effects. He insisted, however, that he has not experienced any side effects except not being able to “see in the morning.” Smith said that was a good enough reason to not take the drug.