Order of prescribing the three medicines

'sulphur, calcaria carb, lycopodium'
the above is a correct order.

There is no 'order' of prescribing in homoeopathy. The symptoms of each remedy needs to be present at the time you prescribe the medicine. That 'order' is part of the complementary relationship between those 3 remedies, which is to say it is just an observation by homoeopaths over the last 2 centuries, that SOME patients may move from one to the other. The only reason you would move from Sulphur to Calc-carb is if the Sulphur helps the patient but then the symptoms change, and then Calc carb becomes indicated (by the presence of those symptoms peculiar to it). The same would need to happen to move on to Lycopodium.

But each of those 3 remedies has other complementaries. Sulphur could just as easily move on to Aconite, Mercurius, Rhus-tox or Nux-vomica. Calc-carb could become Stramonium, Belladonna or Hepar-sulph. Lycopodium might transform into Carbo-veg, Graphites, Iodum or Opium.

Don't for a second think that there are some kind of short-cuts in homoeopathy. No remedy is ever selected without the symptoms that match it being present. You cannot predict what remedy you will need after starting treatment. Only the symptoms can tell you, and only when they change.

So, can you give Lyco after Sulphur?

I have indeed given it after Sulphur, assuming the symptoms call for it. The symptoms are the only guide for remedy selection in homoeopathy. If they call for Lyc you do not give Calc - that would be irrational. I have in fact alternated back and forth between Sulphur and Lycopodium in at least 2 patients that I remember.

Thanks