There is a gangrenous tendency to this remedy, and Cantharis may help in burns developing quickly and going towards gangrene.
A characteristic sensation is: ulcerative pain of the skin when touched.
CLINICAL
Bladder affections. Burns. Chordee. Diphtheria. Dysentery. Eczema. Emissions. Erotomania. Erysipelas. Eyes, inflammation of. Gastritis. Gonorrhoea. Herpes Zoster. Hydrophobia. Kidney affections. Mania. Neuralgia. Nymphomania. Ovaries, affections of. Peritonitis. Pleurisy. Pregnancy, disorders of. Retained placenta. Satyriasis. Scarlatina. Spermatorrhoea. Strangury. Thirst. Throat, sore. Tongue, inflammation of. Urine, abnormal. Vesication of skin.
RELATIONS
Antidotes: Camph. antidotes the strangury and retention of urine of Canth., Apis the cystitis, Kali-n. the renal symptoms. For its throat symptom it is nearest to Caps.
Other antidotes: Aeon., Laur., Puls.
Canth. is antidote to: Camph., Alco.
Compatible: Bell., Merc., Phos., Puls., Sep., Sulph.
Incompatible: Coffea.
Compare: Dory., Coc-c., Cocc-s, Apis, Bell., Bry., Cann-s. (more burning and smarting; Canth. more tenesmus); Petros, (sudden urging); Caps; Puls. (retained placenta); Ars. (delayed urination after parturition); Thuj. (erections; those of Canth. prevent urination; those of Thuj. do not); Merc, (semen mixed with blood); Sars. (urine burns like fire, shred-like particles and blood in it); Arum, Am., Rhus-t., Ran-s.
(Teste classes Canth. with Seneg. and Ph-ac. in his Conium group).