There are currently 4 different IVIG international clinical trials in which the NHS in the UK is involved. They are all at different stages of authorisation and recruitment and are all different. Its easy to look at the whole list of NHS CRPS trials - I think there is a list of about 116 trials currently but, obviously, most of these are closed now.

In case people don't know about it, it is easy to search the International Clinical Trials Registry Platform (ICTRP) which is run by the World Health Organisation (WHO) to find all current, past and planned clinical trials which pertain to CRPS (and every other medical condition). These trials are an international list but many of them are multi-centre international trials so they are sometimes accessible even when you are not in the main host country of the principal academic or clinician running the trial. In conditions with small numbers of potential participants, they tend to be prepared to recruit participants from a greater number of international locations. The inclusion and exclusion criteria for each trial are clearly listed so you can decide if you think you are eligible and then there are contact details for obtaining more information or making contact.