Vision
If the reduction in your medication is also the result of an improvement in your conditions then you are required to notify the DWP of this, however, if there will be no significant change and specifically your limitations will not change then you do not need to contact them.
If you do report a Change to the DWP then it will almost certainly result in a reassessment of your claim, a new PIP2 and a face to face assessment, the Decision will supersede your existing award.
You would not have a review later this year.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
