johnsons nitemgyram 4mg
bob martin spoton margosa extract 3%
diethylene glycol ethyl ether86.9%
Aloha! You're speaking with Dr. Michael Salkin I'll follow up for Dr. Peter with you. Margosa extract is the active ingredient in the spot on. It's a natural repellent found in the seeds of the Indian neem tree. There's no reason to expect a 3% extract to be absorbed into your cat to any appreciable degree. Nitenpyram is systemically active and appropriate to use in conjunction with such a repellent.