ACTIVE INGREDIENT: The active ingredient in Amazon Basic Care Lidocaine Patch is lidocaine 4%, topical anesthetic, which compares to the active ingredient in Aspercreme Lidocaine Patch. NUMBS AWAY PAIN: Amazon Basic Care Lidocaine Patch, 4% Lidocaine, desensitizes aggravated nerves to numb away pain for up to 8 hours. The pain patch features a fast-acting, maximum strength topical anesthetic to calm nerves and temporarily relieve pain. UNSCENTED LIDOCAINE PATCH: No prescription is needed for maximum strength relief for up to 8 hours, with the active ingredient lidocaine 4%. The pain patch is unscented for a fragrance free, non-irritating pain relief experience.