I checked with our professionals' team. If you're wife is not being given sufficient tablets or the wrong doses then the chemist is not following the instructions on the prescription. Your GP can help you to sort this problem out. They may suggest another chemist.
Talk to your GP about what is going on and see if s/he can offer alternatives. If you're still having problems or want to talk to someone in more detail, give our confidential helpline a ring on 0808 800 0303.
I hope that helps,