Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
There should be no problem with administering both Frontline Plus (or Tritak) and Revolution if separated by about a week. If this is his first time getting Revolution, then perhaps this could cause lethargy but that is highly uncommon. It also does not help for ticks (it might help for one species but it is not labeled for tick control).
I think it good you gave him a bath, but this will not remove Revolution; this product is absorbed through the skin and into the body. If you feel he is having a toxic reaction to Revolution, then this is something that will require an immediate evaluation on emergency by a veterinarian and then probably intravenous support to reverse this problem.
There may, however, be something else causing his current symptoms. If he was infested with ticks prior to application of these topical products, then he could be experiencing a bacterial tick-borne disease. Or there may be something entirely unrelated to products or ticks going on such as organ issue (liver, kidney
, pancreas) or anemia or electrolyte problem.
Since Murphy sounds to be worsening I highly recommend have him seen today on emergency, if you have not already proceeded to do such. There is really nothing else you can do at home for what is going on other than what you have already done.
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