Some medicines can affect how lidocaine/prilocaine works. Tell your doctor if you are using any of the following:Acetaminophen, chloroquine, metoclopramide, mexiletine, primaquine, quinine, sulfasalazine, tocainideCancer medicine (including cyclophosphamide, flutamide, hydroxyurea, ifosfamide, rasburicase)Medicine for heart rhythm problems (including amiodarone, bretylium, dofetilide, sotalol)Medicine to treat an infection (including dapsone, nitrofurantoin, para-aminosalicylic acid, sulfonamide)Medicine to treat seizures (including phenobarbital, phenytoin, sodium valproate)Nitrate or nitrite medicine (including nitric oxide, nitroglycerin, nitroprusside, nitrous oxide)
Tell your doctor if you are also using a medicine to treat an abnormal heart rhythm such as amiodarone (Cordarone®), bretylium (Bretylol®), dofetilide (Tikosyn®), flecainide (Tambocor®), mexiletine (Mexitil®), propafenone (Rythmol®), quinidine (Cardioquin®, Quinaglute®, Quinidex®), sotalol (Betapace®), or tocainide (Tonocard®).
Topical application routeDo not use this medicine to treat a skin problem your doctor has not examined.
During the time that the skin feels numb, serious injury can occur. Be especially careful to avoid injury until the numbness wears off and you or your child have normal feeling in the area. Do not scratch or rub the area, and do not allow very hot or very cold objects to touch it.
Using too much of this medicine or using it on a large area of your skin can cause serious unwanted effects. Remove the cream and contact your doctor right away if you or your child have any of these symptoms: lightheadedness, dizziness, vision problems, an irregular or slow heartbeat, difficulty with breathing, or convulsions.
This medicine may cause serious types of allergic reactions, including anaphylaxis. Anaphylaxis can be life-threatening and requires immediate medical attention. Call your doctor right away if you or your child have a rash; itching; hoarseness; trouble with breathing; trouble with swallowing; or any swelling of the hands, face, or mouth after you receive the medicine.
This medicine may cause a rare, but serious blood problem called methemoglobinemia. Remove the cream and call your doctor right away if you or your child develop a blue or bluish purple color on the lips, fingernails, or skin, or have headaches, dizziness, fainting, sleepiness, or trouble with breathing.