What is Mercuric Cyanide used for?

Mercuric Cyanide is used to help manage pain from canker sores and sore throats.

How should I take Mercuric Cyanide for a sore throat?

You should dissolve 5 pellets under your tongue 3 times a day when symptoms first start.

Yes, the dosage instructions for Mercuric Cyanide apply to both adults and children.

Stop using Mercuric Cyanide and talk to a doctor if your symptoms get worse or if they do not improve after 3 days.

You should always keep Mercuric Cyanide out of the reach of children.

It is taken orally by dissolving pellets under the tongue.

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Mercuric Cyanide (Mercurius cyanatus) is an oral human over-the-counter drug used to help relieve pain caused by canker sores and sore throats.

Used for

Pain from canker soresSore throat pain

Conditions

Canker soresSore throat

Class

OTCOral/Throat

Formspellets

Routesoral

Dissolve 5 pellets under the tongue 3 times a day at the start of symptoms until the pain goes away or as your doctor tells you.

Adults and children can use this medication.

Seek help if

Allergens

lactose

Inactive

lactosesucrose

Educational summary derived from FDA labeling, AI-assisted. Not medical advice — consult a healthcare professional. Updated 2026-04-25.