The oral use of cyanocobalamin may lead to several allergic reactions such as hives; difficult breathing; swelling of the face, lips, tongue, or throat.

An examination of the skin and face may show hives, rash, or angioedema (swelling of the lips, face, or tongue).

Chewing fresh feverfew leaves can cause mouth sores; swelling of the mouth, tongue, and lips; and loss of taste.

If you experience an allergic reaction (swelling of the lips, face, or tongue; shortness of breath; or hives), stop using terconazole vaginal and seek emergency medical attention.

Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Food allergies are usually associated with itching, rashes, hives, or, in severe cases, swelling of the mouth and tongue, difficulty breathing, or low blood pressure.

Seek emergency medical attention if you experience an allergic reaction (difficulty breathing; closing of your throat, swelling of your lips, tongue, or face; or hives).

A severe allergic reaction, such as swelling of the face, tongue, or throat.

Get emergency medical help if you have any of these signs of an allergic reaction (which may occur up to 17 days after you receive the shot): hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Symptoms: tingling sensation in the mouth, swelling of tongue and throat, hives, vomiting, abdominal cramps, difficulty breathing, diarrhea, drop in blood pressure and, in rare cases, loss of consciousness.