Green Iodide of Mercury. Hg2I. Called also the Sub-iodide, the Protoiodide, and the Iodide of Mercury. A compound of Mercury 61.35, Iodine 38.65, in 100 parts; or 2 Eq. Mer-cury = 200 + l Iodine=126 = 326, Eq. Wt.

* Lancet, June 2, 1860. Madras Quart. Med. Journ., July 1860, p. 51. Dublin Quart. Journ., Nov. 1849. § Diseases of the Skin, p. 225. || Appendix to Trans, of Lugol on Iodine, pp. 204-5.

¶ Med. Times and Gaz., Oct. 20, 1855.

** Lancet, Dec. 12, 1863.

Med. Times and Gaz., Feb. 14, 1857.

Med. Prop and Action. Alterative and stimulant. In long-continued doses it occasionally produces salivation, and, in large quantities, proves an irritant poison. Externally, it is applied in the form of ointment (oz. j., Wax oz. ij., Lard oz. vjj.

Dote, gr. j. - gr. iij., in the form of pill.

1473. Therapeutic Uses

Syphilis. In primary syphilitic sores occurring in strumous habits, and also in constitutional Syphilis, the Green Iodide of Mercury has been extensively and successfully employed.* M. Cullerier's formula is as follows: - ℞. Hyd. Iod. (Vir.) gr. xij., Opii gr. vj., Gum Guaiac. 3j., M. ft. pil. xxiv., cap. j. noete maneque. Externally, at the same time, he employs the ointment (j. ad Adipis j.). Numerous cases of Syphilitic Ulcerations and Eruptions, successfully treated by this remedy, are recorded by Biett, Breschet, and others, Dr. Schedel remarks, "Of its good effects too much cannot be said." It should be given internally and externally, but not to such an extent as to cause salivation; if this appear in the slightest degree, the medicine should be immediately discontinued. In Syphilitic Ulcerations of the Throat, Dr. Schedel recommends them to be slightly touched two or three times a day, with a liniment composed of gr. xx. of the Green Iodide in ss. of Honey.

1474. Skin Diseases

In Lupus, Dr. Houghton§ states that he derived great benefit from this salt, the ulceration having, in some instances, healed with a rapidity quite foreign to its indolent nature. He administered it internally, in doses of gr. 1/4 - 1/2, twice daily. In Pityriasis, Eczema, Herpes, Impetigo, and other diseases of the Scalp, occurring in children, Dr. Neligan|| derived great benefit from the following formula: -1474 Skin Diseases 133 Hyd. Iod. (Vir.) gr. ss., Hyd. c. Cret. gr. ij., Pulv. Aromat. gr. ij., M. To a child of six years old this may be given every morning; or if not more than three years old, half the quantity may be given twice a week. To infants it should not be given. In Rupia, Lepra, and Psoriasis, it was successfully employed externally (gr. xij. - j. ad Ung. gj.), by Biett; and in Acne Rosacea, Mentagra, and Tuberculous diseases of the Skin, by Bayer. Its internal administration greatly aids its external use. In Bronchocele, Porta¶ strongly advises an ointment composed of gr. v. of the Green Iodide in j. of Lard. It is inferior to the Bed Iodide (which see).

1475. In Tic Douloureux And Other Neuralgic Affections, An Ointment Composed Of Ij

of the Green Iodide and j. of Lard, is strongly recommended by Mr. J. Scott as a remedy of great efficacy.

* Parker on Syphilis, App. to O'shaughnessy's Trans, of Lugol, p. 201, et seq. Lib. of Med., vol. i. p. 429. § Cyc. Pract. Med., vol. iii. p. 180.

|| On Diseases of the Scalp, 8vo, 1848.

¶ Brit, and For. Med. Chir. Rev., Jan 1851.

1476. In some Chronic Diseases of the Liver, especially Induration of that Organ, the Green Iodide may be employed externally or internally, or both, with every prospect of benefit. It should not be given to such an extent as to produce ptyalism.