@lizadiet. It didn't cause low blood pressure, it caused dangerous haematological problems because I already had severe anaemias and low ferritin. The rash covering my hands was bleeding and weeping for weeks and became infected, all from cross contamination of gluten from an unknown source. Sometimes medications are needed, despite potential side effects.
I realise you are trying to help, but not everything is simply explained by the calorie/burn diet you generally recommend; I was a bit concerned about your advice. I've had a look at your other posts (was wondering if you had CD or DH) and see that all your posts are diet advice, many mentioning your clients.
You suggested on this post that the OP could try 'a new diet' instead of medication but from your comments I'm thinking you assumed the OP had a general rash and/or you have no experience with CD or DH so not sure what sort of new diet you were even thinking of? DH isn't a choice of 'new diet to avoid medication' and your simplistic advice could be confusing for a newly diagnosed person.
Also liza, often the calorie controlled diet that all your clients always lose weight on doesn't always follow with people with DH/CD because, after possibly years of (vastly varying degrees) of malabsorption leading to malnutrition, the weight gain can be significant because the body is readjusting.
Almost all users of dapsone have haematological side effects, such a losing 1-2g of haemoglobin. If you already have anaemia these side effects can be significantly increased, as in my case... Not low blood pressure.
Sorry for the long post Liza, I understand you were trying to be helpful but wanted to explain a few important things about 2 conditions that are often misunderstood so you can learn more before giving a potential client of yours wrong advice in the future. I hope you understand my reasoning.