Samantha is a 40 year old lady with a several month history of unilateral throbbing headaches with associated nausea. They are exacerbated by stress and there are no red flags in the history. Neurological examination is normal and you suspect she is suffering with migraines. You discuss starting a triptan as Paracetamol and Ibuprofen have been little relief.

Which one of the following statements about triptans is least correct?