If you are a pensioner with an income below 18.000 euros and the subsidy on the co-pago for prescriptions that the Valencian government announced to be effective per 1.1.2016, is not applied automatically, so you are still paying the maximum of 8,23 euros/month to the farmacy when you get your prescriptions filled, instead of receiving them for free, you can check online whether you should be entitled, through this link.
Your card and your prescriptions should also mention this ´code´ that would identify you as a ´low income pensioner´ to the pharmacy. TSI 002 – 01
As said, the subsidy should be granted automatically, but if it is not, for whatever reason, here is the info from the Generalitat on how to apply. You can do so till the end of 2016. Assuming that in 2017, you can do so till the end of 2017.
The form to use.