Sugammadex Clinical data AHFS/Drugs.com Licence data EMA: Pregnancy cat. ? Legal status ? Routes Intravenous Identifiers CAS number ATC code V03 PubChem ChemSpider UNII KEGG Chemical data Formula C72H104Na8O48S8 Mol. mass 2178 g/mol (what is this?)
Sugammadex (designation Org 25969, tradename Bridion) is an agent for reversal of neuromuscular blockade by the agent rocuronium in general anaesthesia. It is the first selective relaxant binding agent (SRBA) and was discovered at the Newhouse research site in Scotland. . These scientists who discovered Sugammadex worked for the pharmaceutical company, Organon. Organon was acquired by Schering-Plough in 2007; Schering-Plough merged with Merck in 2009. Sugammadex is now owned and sold by Merck.
On January 3, 2008, Schering-Plough submitted a New Drug Application to the US Food and Drug Administration for sugammadex, but the FDA rejected the application on August 2008. It was approved for use in the European Union on July 29, 2008.
Sugammadex is a modified γ-cyclodextrin, with a lipophilic core and a hydrophilic periphery. This gamma cyclodextrin has been modified from its natural state by placing eight carboxyl thio ether groups at the sixth carbon positions. These extensions extend the cavity size allowing greater encapsulation of the rocuronium molecule. These negatively charged extensions electrostatically bind to the positively charged ammonium group as well as contribute to the aqueous nature of the cyclodextrin. Sugammadex's binding encapsulation of rocuronium is one of the strongest among cyclodextrins and their guest molecules. The rocuronium molecule (a modified steroid) bound within sugammadex's lipophilic core, is rendered unavailable to bind to the acetylcholine receptor at the neuromuscular junction.
The main advantage of sugammadex is reversal of neuromuscular blockade without relying on inhibition of acetylcholinesterase. Therefore it does not cause the autonomic instability produced by anticholinesterases such as neostigmine, and antimuscarinic agents such as atropine do not need to be co-administered. Its administration is therefore associated with much greater cardiovascular and autonomic stability than the traditional reversal agents.
In addition, when a fast onset and short duration of muscle relaxant is required, there has been little choice previously apart from the use of suxamethonium. However, suxamethonium is not ideal, as it has some undesirable side effects, such as anaphylaxis, increasing serum potassium levels and other cardiovascular properties. Since, in high doses, rocuronium has a reasonably rapid onset and now can be reversed with sugammadex, it can potentially be used instead.
'Recurarisation', a phenomenon of recurrence of neuromuscular block, may occur where the reversal agents wear off before a neuromuscular blocking drug is completely cleared. This is very unusual with all but the longest acting neuromuscular blocking drugs (such as gallamine, pancuronium or tubocurarine). It has been demonstrated to occur only rarely with sugammadex, and only when insufficient doses were administered. The underlying mechanism is thought to be related to redistribution of relaxant after reversal. It may occur for a limited range of sugammadex doses which are sufficient for complex formation with relaxant in the central compartment, but insufficient for additional relaxant returning to central from peripheral compartments. 
Sugammadex also has some affinity for other aminosteroid neuromuscular blocking agents such as vecuronium and pancuronium. Though sugammadex's affinity for vecuronium is lower than its affinity for rocuronium, reversal of vecuronium is still effective because fewer vecuronium molecules are present in vivo for equivalent blockade. Vecuronium is approximately seven times more potent than rocuronium and overall requires fewer molecules to induce blockade. Sugammadex encapsulates with a 1:1 ratio and therefore will adequately reverse vecuronium as there are fewer molecules to bind compared to rocuronium.  Shallow Pancuronium blockade has been successfully reversed by sugammadex in phase III clinical trials. 
A study was carried out in Europe looking at its suitability in rapid sequence induction. It found that sugammadex provides a rapid and dose-dependent reversal of neuromuscular blockade induced by high-dose rocuronium.
A Cochrane systematic review on sugammadex has been recently published by Abrishami et al. This review article included 18 randomized controlled trials on the efficacy and safety of sugammadex. The trials included a total of 1321 patients. The review concluded that “sugammadex was shown to be more effective than placebo (no medication) or neostigmine in reversing muscle relaxation caused by neuromuscular blockade during surgery and is relatively safe. Serious complications occurred in less than 1% of the patients who received sugammadex. The results of this review article (specially the safety results) need to be confirmed by future trials on larger patient populations”. 
Sugammadex was generally well tolerated in clinical trials in surgical patients or healthy volunteers. In pooled analyses, the tolerability profile of sugammadex was generally similar to that of placebo or neostigmine plus glycopyrrolate.
- ^ Naguib M (2007). "Sugammadex: another milestone in clinical neuromuscular pharmacology.". Anesth Analg 104(3): 575–81. PMID 17312211
- ^ "U.S. FDA Issues Action Letter for Sugammadex" (Press release). Schering-Plough. 2008-08-01. http://www.schering-plough.com/schering_plough/news/release.jsp?releaseID=1182475. Retrieved 2008-08-02.
- ^ "BRIDION(R) (sugammadex) Injection - First and Only Selective Relaxant Binding Agent - Approved in European Union" (Press release). Schering-Plough. 2008-07-29. http://www.schering-plough.com/schering_plough/news/release.jsp?releaseID=1180933. Retrieved 2008-08-02.
- ^ Miller R (2007). "Sugammadex: an opportunity to change the practice of anesthesiology?". Anesth Analg 104 (3): 477–8. doi:10.1213/01.ane.0000255645.64583.e8. PMID 17312188.
- ^ Eleveld DJ; Kuizenga, K; Proost, JH; Wierda, JM (2008). "A Temporary Decrease in Twitch Response During Reversal of Rocuronium-Induced Muscle Relaxation with a Small Dose of Sugammadex". Anesth Analg 104 (3): 582–4. doi:10.1213/01.ane.0000250617.79166.7f. PMID 17312212.
- ^ Welliver M (2006). "New drug sugammadex; A selective relaxant binding agent". AANA J 74(5): 357–363. PMID 17048555
- ^ Decoopman M (2007). "Reversal of pancuronium-induced block by the selective relaxant binding agent sugammadex". Eur J Anaesthesiol. 24(Suppl 39):110-111.
- ^ Pühringer FK, Rex C, Sielenkämper AW, et al. (August 2008). "Reversal of profound, high-dose rocuronium-induced neuromuscular blockade by sugammadex at two different time points: an international, multicenter, randomized, dose-finding, safety assessor-blinded, phase II trial". Anesthesiology 109 (2): 188–97. doi:10.1097/ALN.0b013e31817f5bc7. PMID 18648227.
- ^ Abrishami A, Ho J, Wong J, Yin L, Chung F. (October 2009). Abrishami, Amir. ed. "Sugammadex, a selective reversal medication for preventing postoperative residual neuromuscular blockade". Cochrane Database of Systematic Reviews (4): CD007362. doi:10.1002/14651858.CD007362.pub2. PMID 19821409.
- ^ Yang LPH, Keam SJ..Drugs 2009;69(7):919-942.doi: 10.2165/00003495-200969070-00008.
Antidotes (V03AB) Nervous systemBarbiturate overdoseBemegride • EthamivanBenzodiazepine overdoseGHB overdoseReversal of neuromuscular blockadeSugammadex Cardiovascular OtherParacetamol toxicity (Acetaminophen)Other Emetic
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