Information is being sought by police after £700 of veterinary medicine was stolen from a vehicle parked in Skipton Old Road, Colne, on Friday, October 11th.
The medicine includes sedatives and barbiturates which could be fatal if consumed by humans.
A total of 22 different types of medication were taken and others include antibiotics, anti-inflammatories, anaesthetics and vitamins.
A pair of Hardy fishing over-trousers valued at £200 and a chip reader also worth £200 were taken from the Land Rover Defender.
Sgt Shaun Pearson said: “These drugs which were stolen are in glass vials and are still outstanding.
“They can be serious and potentially fatal to humans if digested or injected.
“They are not any type of party drug whatsoever, they are very strong drugs for large cattle.
“If anybody sees these glass vials or has any information on their whereabouts, call the police immediately.
“They may have been discarded somewhere rurally but we do need to find them. As well as humans, they could potentially be harmful to pets.”