The expected effect of lidocaine is numbness of the target tissue. There are very few side effects of lidocaine used in this way. Side effects are those effects that accompany a medicine's use. After all, he is the one who knows your heart condition. Lidocaine has strong effects on the heart (it's an antiarrhythmic drug which also, like most antiarrhythmic drugs, may provoke arrhythmias). You are not alone. We studied 10,411 people who take Lidocaine and have side effects from FDA. Muscle fasciculation was reported. See who they are, when they have it, other medications they take and conditions have. I was given an injection of lidocaine and keralge for lower lumbar pain. i'm not sure how to spell the second one. are there any side effects?. Lidocaine, also known as lignocaine, is a medication used to numb tissue in a specific area (local anesthetic). It is also used to treat ventricular tachycardia and to perform nerve blocks. For the Consumer. Applies to lidocaine: intradermal powder. Along with its needed effects, lidocaine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention. Lidocaine injection is sometimes used to treat irregular heart rhythms that may signal a possible heart attack. Lidocaine injection is also given in an epidural (spinal block) to reduce the discomfort of contractions during labor. Effects of lidocaine on blood pressure, heart rate, electrocortical activity, pH, and blood gases were studied in chronically catheterized sheep fetuses in utero. We use cookies to offer you a better experience, personalize content, tailor advertising, provide social media features, and better understand the use of our services. Lidocaine belongs to group of drugs known antiarrhythmics, which work by preventing sodium being pumped out of the cells of the heart to help the heart beat normally.