I’m not from your area , but I read that Clonazepam can replace Rivotril

I assume lorazipam or other medicines that are part of benzodiazepime families. I know one person who uses lorazipam for seizures but i'm not sure if it comes in a liquid. You should be able to call the pharmacy and ask about possible alternatives or call your neurologist to let you know alternatives. I had to do that with my prescription recently because my meds have been backordered. Good luck!