The Professor, who only does a day a week at the Memory Clinic now, phoned me at 9.15 on that day i.e. at the earliest opportunity. He was very concerned and did not question at all the idea that such a small dose could cause such havoc. He was fairly encouraging about there being no lasting effect and this seems to be the case.
S has now been referred to the district community team, so we await contact from them. Apparently the team is made up of people from various disciplines and we will get regular visits which is welcome - although it has been reassuring to know that we have had advice from a leading expert, we have seldom seen the Professor more often than once a year.