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Testosterone.
cheaper long term maintance costs and lower parts costs.
no
Oral phosphates can lower serum calcium levels, but the long-term use of this approach is not well understood.
"Some long term affects for someone who is considering a tubal ligation reversal are lower success rates for pregnancies, or the possibility of having to use in-vitro fertilization to aid in the process of conceiving again."
Probably, but most veterinarians use other medications since getting human diphenhydramine preparations down to an acceptable doseage for cats is very difficult.
Long term use of Acetaminophen can effect your liver. More at link.
can long term gains be offset by short term losses
no
Yes! combine it with lidocaine 4%
liver
Yes, you could probably get some psychoactive effects off of the diphenhydramine, but if there are any other ingredients, it might cause serious harm.