Mercurius iodatus flavus
Mercury(I) iodide (mercurous iodide, yellow) · Mercurous iodide,Hydrargyrum iodatum flavatum · Mineral
Merc. iod. flav. is most appropriate for people who tend to alternate rapidly between depression and high spirits.
The classic symptom picture for Merc. iod. flav. is of right-sided complaints, particularly throat infections with swollen glands and a coated tongue. If pharyngitis, tonsillitis, or ear infections affect the right side, Merc. iod. flav. is strongly indicated. Common symptoms include a sensation as if there is a lump in the throat, throat inflammation, and ulcerated patches in the throat that exude a cheeselike mucus. Sharp, throbbing pains may affect the right ear, becoming worse on swallowing.
Key symptoms
- Throat affections with greatly swollen glands; worse on right side
- Tongue coated thickly yellow at the base
- Lacunar tonsillitis with cheesy exudates and offensive breath
- Swelling begins on right side; symptoms travel from right to left
- Constant inclination to swallow; sensation of a lump in throat
- Mammary tumors with warm perspiration and gastric disturbances
- Swollen, hard inguinal glands; syphilitic chancre with persistent induration
Worse (aggravation)
Better (amelioration)

Proto-iodide of Mercury
Throat affections, with greatly swollen glands and characteristic coating of tongue. Worse, right side. Chancre; induration remains long time. Swollen inguinal glands, large and hard. Mammary tumors, with tendency to much warm perspiration and gastric disturbances.
Tongue
Coated thickly; yellow at the base. Tip and edges may be red and take imprint of teeth.
Throat
Lacunar tonsillitis. When only the superficial part of the tonsil is involved. Cheesy exudates with offensive breath. Swelling begins on right side. Small ulcers on posterior pharynx. Easily detached patches on inflamed pharynx and fauces; worse on right tonsil; much tenacious mucus. Sensation of a lump. Constant inclination to swallow.
Relationship
Compare: Plum iod (in mammary tumors).
Dose
Second trituration.

There are sore throats that especially call for the proto-iodide.
When in sore throats the inflammation and pain predominantly affect the rightside, and there is a tendency to remain on the right side, or if the Merc. state is present and the sore throat goes from right to left, it is the proto-iodide you want.
The patient that needs this remedy for constitutional troubles will be worse during rest and from a warm room and better in the open air.
This is especially true when the patient needs Merc. prot. in neuritis of the right arm that comes on in writers.
The arm then is very painful when writing, from passive motion, from rubbing, from pressure, from both beat and cold, but better from walking in the open! air.

- Posterior wall of pharynx dotted with patches of mucus and small spots which look ulcerated.

Phatak's chapter on Mercurius iodatus flavus is available in the app.
Read Phatak in the appClassical texts are in the public domain. Educational reference only — not medical advice.