But how exactly do painkillers work?

“There are different categories of pain killers, however most painkillers work to inhibit the pain receptors in the brain or the chemicals that are generated from a physiological change that causes pain,” explained Anshu Bhimbat, a pharmacist for LloydsPharmacy.

“For example, opioid painkillers such as codeine block pain receptors whereas paracetamol inhibits the chemicals released by an injury. “However, both types stop your brain from receiving chemicals that interpret the sensation of pain.

“Non-steroidal anti-inflammatory drugs - or NSAIDs - also inhibit the production of the chemical prostaglandin, which causes inflammation.” Paracetamol and ibuprofen are perhaps the most well known painkillers. The former is used for mild or moderate pain, such as headaches, toothache or sprains, according to the NHS.