A local anesthetic (LA) is a medication that causes absence of pain sensation. When it is used on specific nerve pathways (local anesthetic nerve block), paralysis (loss of muscle power) also can be achieved. Local anesthetics produce anesthesia by inhibiting excitation of nerve endings or by blocking conduction in peripheral nerves. This is achieved by anesthetics reversibly binding to and inactivating sodium channels. Coagulopathy, previously considered an absolute contraindication, may be considered depending on the level of derangement. Another relative contraindication of spinal anesthesia is sepsis distinct from the anatomic site of puncture (eg, chorioamnionitis or lower extremity infection). Start studying Drugs and Disease exam 3. Learn vocabulary, terms, and more with flashcards, games, and other study tools. This topic will discuss the selection of medications for pediatric procedural sedation outside of the operating room. The properties of agents commonly used for Diphenhydramine is an antihistamine mainly used to treat allergies. It is also used for insomnia, symptoms of the common cold, tremor in parkinsonism, and nausea. It is used by mouth, injection into a vein, and injection into a muscle. Maximal effect is typically around two hours after a dose, and effects can last for up to seven hours. Lidocaine dosages in pediatric patients should be reduced, commensurate with age, body weight and physical condition. When multiple formulations of lidocaine are used at once, the amount systemically absorbed from all formulations must be considered. Effective and rapid hemostasis is critical to optimize surgical outcomes. An advantageous adjunct in accelerating the clotting process during dermatologic surgery is the use of topical hemostatic agents, which allow dermatologic surgeons to quickly clear the surgical field while avoiding the adverse effects of systemic medications. Dosage forms listed as Xylocaine (lidocaine) -MPF indicate single dose solutions that are Methyl Paraben Free (MPF). Xylocaine (lidocaine) MPF is a sterile, nonpyrogenic, isotonic solution containing sodium chloride. Academia.edu is a platform for academics to share research papers.