A search on "iodine" in the 1899 Merck Manual returns 96 hits. "Iodide", 100 hits. Were I to repeat the search using the term "iodopin" or "iodophorm", even more results would be returned...
Below is a sampling of conditions for which iodine in one or another form was prescribed in 1899. Iodine was certainly NOT the only suggested medicine, I am listing these conditions only to show you the wide range of conditions for which iodine was once prescribed. It was prescribed in many forms, from tincture to potassium iodide to iodized oil, and administered in a variety of ways, from internal dosing to painting to injection to inhalation. Some of the indications are to be expected, such as the use of iodine for goiter or uterine fibroid. Others were unexpected, such as the use of an iodine enema in hepatitis. This manual was published well after the initial iodine enthusiasm in the early part of the century, so I imagine that these treatments were well-established in 1899.
iodine: painting the line of the pneumogastric nerve with liniment or tincture in pure spasmodic asthma
Hordeolum(stye).- see also, eyelids
Carbolate of Iodine
iodine, iodi-tannin, solution of iodine and tannic acid, on cotton wool
iodine, solution not too strong painted over.
iodine, potassium iodide
carbolate of iodine, in the later stages of typhoid, and in chronic malarial poisoning
iodine, antiseptic dressing
glanders and farcy: more info here: Glanders in a Military Research Microbiologist
iodine, internally and painted around, not over the gland.
iodoform, as a dressing to breaking-down glands.
iodoformogen: equitable and persistent in action on open glands.
lead iodide: ointment
iodine: internally, and locally as ointment or tincture, and as injection
iodide of potassium
gums, diseases of
iodine tincture, locally
iodine, as enema
iodine or iodides
iodine, potassium iodide
iodine, injections after tapping.
joint affections, see also arthritis, bursitis, etc
iodoformogen, more diffusible and persistent than iodoform
keratitis- see also, corneal opacities
iodine, as inhalation and counter-irritant over neck.
iodine, as counter-irritant
iodine, in glycerin
menorhaggia and metrorrhagia- see also, amenorhea, hemmorhage, uterine tumors
mercurial cachexia - a condition arising from over-use of mercury- containing medications. for more: mercurial cachexia
iodine and iodides
nevus- see also, tumors, warts
iodine: painted on to remove tartar on teeth; and in exposure of fang due to atrophy of gum.
opthalmia- see also, blepharitis, conjunctivitis, keratitis
iodine, iodoform, iodoformogen, iodole
ozena- see also, catarrh, chronic, nasal
carbolate of iodine
glycerine and iodine
iodine: as inhalation. Much benefit is derived from washing out the nose with a solution of common salt, to which a few drops of the tincture of iodine have been added.
pericarditis- see also, endocarditis
pharyngitis- see also, throat, sore, tonsillitis
phthisis- see also, cough, hemoptysis, hectic fever, perspiration, night sweats, laryngitis, tubercular, meningitis, peritonitis, etc
iodine: liniment as a counter-irritant to remove the consolidation in early stages, and to remove pain and cough later, as inhalation to lessen cough and expectoration.