“They’re given inappropriate advice and treatment, and often harmful treatment,” Mr Lane said. “By the time these individuals get to our clinics, they have a headache most of the time and they’re taking copious amounts of medication, which makes it worse.” He warned that repeated use of codeine-based drugs, such as Co-codamol or Panadol, was likely to result in a “medication-overuse headache” — a headache all day, every day.