A dose setting mechanism comprising a first element and a second element the first element being moveable with respect to the second element the first element and the second element being coupled by a ratchet mechanism allowing motion of the first element with respect to the second element from a first position to a second position only in a first direction while preventing motion in a second direction that is opposite to the first direction once passing the second position, the first element being moveable with respect to the second element in the first direction and in the second direction.
