Cocainise is not a common word, and as such, finding synonyms can be a bit challenging. However, there are some words that can be used interchangeably with it to convey the same meaning or something similar. Some of these words include; drug, medicate, intoxicate, narcotize, anaesthetize, and stupefy. These words all relate to the use of substances that can alter the state of mind, induce sleep or pain relief. When using any of these synonyms, it's essential to be aware of their meanings and context, as they all have different connotations that might affect the message being conveyed.