WHEN STUART CLOSE  MENTIONS ABOUT BOENNINGHAUSEN'S OBSERVATIONS ( addendum Dr. Nash in his Materia Medica and Allen keynotes reference)

Deficient reaction or diminished susceptibility may exist in a case or appear during treatment and constitute a condition requiring special treatment. This is especially true in the treatment of chronic diseases, where improvement ceases and well selected remedies do not seem to act. Under such circumstances it may sometimes be necessary to give a due of what is called an "intercurrent remedy." Bœnninghausen mentions as appropriate in such cases: Carbo veg., Lauroc., Mosch., Op., Sulph. To these may be added the typical nosodes: Medorr., Psor., Pyrog., Tuberc., Syphil.,. and also Thuja. The choice of any particular one of these remedies must be governed by the history and symptoms.

Addendum :
Dr. Nash
The fact that Opium is capable of banishing pain, or, rather, I should say, rendering the organism incapable of sensing pain, is one of the chief indications for its use in homœopathic therapeutics. There is not only complete absence from pain, but as complete unsusceptibility to general drug action. You know that we are told that when the seemingly indicated remedy does not act give Sulphur. Now it may be that Opium is a better remedy to give, if all there is of the case is that there seems to be no vital reaction. Sulphur would be likely to be the best remedy if the lack of reaction were due to some psoric taint; but even here all the symptoms must be taken into account. Laurocerasus is another remedy to arouse reaction when it seems to depend upon excessively low vitality. Psorinum may succeed in psoric obstructions to vital reactions when Sulphur fails. There is nothing to be more condemned in homœopathic prescribing than routinism.

Dr.HC Allen mentions Valeriana also bring  in such conditions

Something morefrom Dr.Nash

Capsicum, lack of reaction in persons of lax fibre."

Opium, in patients where there is no pain; stupidity and drowsiness.

Valerian and Ambra in nervous affections, well chosen remedies fail.

Carbo vegetabilis, collapse, coldness of knees, breath; perfect indifference.

Sulphur and Psorinum, where Psora complicates and hinders reaction.

Each one of these remedies may he called for in defective reaction, and there may be many more, and in each case, as with all remedies elsewhere, symptoms must decide whichone.

CLINICAL POINTERS AND REMEDY RELATIONSHIP

We know that Silicea and Fluoric acid are complementary remedies;Fluoric acid should be considered after Silicea has been abused in suppurative conditions.(Dr.Pulford)

Relationship of Fluoric acid is very well enlisted in Allen's keynotes

A Psychiatrist talks about Homoeopathy (One of the most subtle and thought provoking lines that I  came across)

To be a Homoeopath is to believe in the law of similarity and to believe in the law of similarity
means to believe more in the reaction of the organism than in the action of the environment.Otherwise we are not Homoeopaths.To believe in the law of similarity is to believe in dilutions,and to remember that a remedy is dynamic when it acts,but but it is only Homoeopathic when the physician decides that remedy,given to the healthy individual causes what he says that particular patient has.
ONLY THE PHYSICIAN MAKES A REMEDY HOMOEOPATHIC , PHARMACISTS ONLY MAKE DYNAMIC REMEDIES .

- Dr.Fernando R (Venezuelan Psychiatrist and practicing Homoeopath)

Noteworthy is that such depth and refinement in thought comes from a country we can hardly loacte on world map and only know about it because of school geography lessons and Beauty pageants...as we know many beauty pageant winners are Venezuelan beauties.
Unfortunately Caracas the Captial of Venezuela is one of the most unsafe cities of the world

CLINICAL POINTERS

Enuresis after catheterization - Mag phos

SOME PROMINENT ARSENICUM ALBUM TRAITS COMPARED WITH OTHER POLYCHRESTS

Ars is dependent while Nux is independent /self reliant

Mental labour performed best at night, creative energy at peak - Lachesis while Ars alb works best in the morning...is incapable of functioning at night.....

Sulphur criticizes others for faults which he also has; Nux v for faults that differ from his while Ars is censorious to both kinds of defects

CLINICAL POINTERS

Ailments from electrocution : Phosphorus

Never well since Radiation or Chemotherapy : Cadmium sulph...

Palliative of nausea following chemotherapy : Ipecac

Do think if........

Do think of Sanicula when thinking of Silicea

Do think of Nux v when thinking of Sulphur

Do think of Nat mur when thinking of Sepia

And vice versa