I left my Klonopin bottle in my car stored in my garage last night. It probably was 40 degrees last night. Will this have any negative impact on my medication? Is it safe to take?
It was probably better for it than being in your warm house really, unless you opened it immediately upon bringing it in and condensation formed on it. Actually, I don't know if water is bad for clonazepam... but either way, cool temps are no issue.
Cold = drugs lasting longer (maybe there are rare exceptions to this, but I don't know of any). If you want your drugs to last a long time, they will last longer the colder they are. In general with everything, heat degrades things (not just drugs, but including drugs).