Stick to oral route, it has 90% bioavailability.
Pregabalin goes through little to no metabolisation with something like 97% being excreted unchanged in urine.
@yubacity there are rare cases that I’ve seen where gabapentin has done reversible damage to the kidneys.
Pregabalin is still a funny drug that’s being researched in regards to side effects etc but for those with issues with their kidneys as I’m sure you probably may have had due to your use of other drugs then it’s not advisable to use it.
@Forever Changes just to say, whilst I trained as a Dr and practiced for a year I moved straight into research science. I wouldn’t and can’t give advice from the standpoint of being a Dr. I just try to explain what I know from my observations and my own prescribed use due to my own health issues.
Edit to add: whilst I can give very a general explanation it in no way makes up for what your own Dr can tell you. They know your medical history etc and your first port of call especially in regards to kidney issues should always be your own Dr.