There were 10 seizures of the Class B drug, with more than 18kg found.
Ketamine, also known as 'Special K', is sold as a grainy white or light brown powder.
It is a powerful general anaesthetic, which can create a dreamlike, relaxed feeling and hallucinations.
It can also cause agitation, memory problems, bladder problems, liver damage and depression.
If too much is taken or if it is mixed with other drugs it can be fatal.
'Ket' has not been a big issue in Guernsey before. The last time any was seized by the GBA was one seizure of 5.9g made in 2021.
With seizures it is hard to know how much of a drug is actually arriving into the island undetected.
Charity Independence helps people with issues with drugs, alcohol and gambling.
Executive officer Tracy Rear said ketamine had not been an issue which people had been presenting at the charity with.
But if people did have a problem, they can self-refer to get help.
There has been a rising problem with ketamine in the UK, with the UK adult substance misuse treatment statistics 2023 to 2024 showing that more than 3,600 ketamine users starting treatment was more than eight times higher than it was in 2014 to 2015.
The drug hit the spotlight after the death of Friends actor Matthew Perry, with the coroner finding ketamine was the primary cause.
The report noted that some of seizures, including ketamine and herbal cannabis, were not destined for the bailiwick.
‘These seizures were identified as being transhipped through this jurisdiction and were found concealed in clothing and various items of office equipment,’ it said.
‘The Guernsey Border Agency is liaising with other jurisdictions on these matters.’
The total value of all the drugs seized last year was £1.9m., meaning the ketamine made up the vast bulk of that value.
There were eight seizures of Class A drugs, valued at £54,000.
In Class B there were 14 seizures of herbal cannabis and two for cannabis resin.
In Class C, steroids were among the most common seizure, with seven vials and four tablet seizures.
The total value of Class C seizures was £16,000.
Overall there were 74 seizures across all classes last year, compared with 115 last year and 143 the year before.
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