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Synera is part of the Local Anesthetics class and treats Pain and Anesthesia. Local anesthetics are used as anesthesia and to treat pain, postherpetic neuralgia, and ear infections. They work by blocking pain signals in the nerves. Synera is only available as a brand name drug. Compare local anesthetics.
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Synera Side Effects

Common and Rare Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor or nurse immediately if any of the following side effects occur:

More common

Flushing or redness of the skin

swelling

unusually warm skin

Less common

Blistering, burning, crusting, dryness, or flaking of the skin

change in the color of treated skin

itching, scaling, severe redness, soreness, or swelling of the skin

rash

Rare

Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings

cough or hoarseness

fainting or loss of consciousness

fast or irregular breathing

fever or chills

hives or welts

lower back or side pain

painful or difficult urination

swelling of the eyes or eyelids

tightness in the chest or wheezing

trouble with breathing

Incidence not known

Blurred vision

chest pain or discomfort

cold, clammy, or pale skin

confusion

difficulty with breathing

difficulty with swallowing

dizziness

dizziness, faintness, or lightheadedness when getting up from a lying or sitting position suddenly

fast, slow, or irregular heartbeat

feelings of coldness, heat, or numbness

irregular, fast or slow, or shallow breathing

large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs

no breathing

noisy breathing

pale or blue lips, fingernails, or skin

puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue

seizures

shakiness in the legs, arms, hands, or feet

shortness of breath

slow heart rate

sweating

trembling or shaking of the hands or feet

twitching

unconsciousness

unusual tiredness or weakness

Get emergency help immediately if any of the following symptoms of overdose occur:

Symptoms of overdose

Change in consciousness

fast, pounding, or irregular heartbeat or pulse

no blood pressure or pulse

stopping of heart

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Rare

Headache

nausea

sleepiness or unusual drowsiness

vomiting

Incidence not known

Continuing ringing or buzzing or other unexplained noise in the ears

depression

double vision

drowsiness

false or unusual sense of well-being

fear

hearing loss

nervousness

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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