Moreover , ketamine was discovered and was better tolerated as an anesthetic .
Its use in humans was disallowed in the United States in 1965 due to the high rates of side effects while its use in other animals was disallowed in 1978 .
Ketamine was discovered and was better tolerated as an anesthetic .
Its use in humans was disallowed in the United States in 1965 due to the high rates of side effects while its use in other animals was disallowed in 1978 .