Tighter controls should be put on the painkiller tramadol according to the UK's official drugs advisers.

BBC: Tramadol pill

The veterinarian told me that tramadol is not metabolized for a narcotic effect in dogs because their metabolism is different from that of humans.

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"The ACMD's review of harms associated with the non-medicinal use of tramadol was prompted by an increasing number of reports within the NHS of tramadol's misuse and harms, " the letter said.

BBC: Tramadol pill

The ACMD's chairman Prof Les Iversen called for tramadol to be made a Class C drug, with penalties of up to two years in prison for possession and 14 years for supply.

BBC: Tramadol pill