Editing Cytoprethaline

{{Status|Canon}}
[[File:FUD - Cytoprethaline Injector.jpg|thumb|225px|A cytoprethaline injector in-use.]]
{{Quote|Turns out the cryo blisters and your difficulty breathing are an allergic reaction to the cytoprethaline. It's a drug we inject to keep ice crystals from forming in your cells during cryosleep. Occurs in about 1 in every 50,000 or so.|Doctor [[Hughes]]{{Ref/Film|Id=FUD3|FuD|Detail=Part 3}}}}
'''Cytoprethaline''' is a cellular anti-crystalline drug designed for [[human]]s in [[Cryo chamber|cryo-sleep]]. Within the [[Unified Earth Government]], cytoprethaline is an [[Wikipedia:Prescription drug|Rx-only drug]]; legal only through a medical prescription.{{Ref/Site|Id=waypoint|URL=https://www.halowaypoint.com/en-us/universe/tech/cytoprethaline|Site=Halo Waypoint|Page=Cytoprethaline|D=27|M=10|Y=2015}}

==Medical uses==
Cytoprethaline prevents damage to cell membranes from ice crystal formation. It is usually injected, recommended by a doctor, but usually by a [[medic]] or a pre-measured self-injector.{{Ref/Book|Id=Enc09|Enc09|Page=216}}{{Ref/Book|Id=Enc11|Enc11|Page=226}} The injection of cytoprethaline is routed into the [[Wikipedia:Subcutaneous tissue|subcutaneous tissue]].{{Ref/Reuse|waypoint}} Cytoprethaline was developed around the same time that [[cryonics]] became commonplace due to interstellar travel, to account for the dangers of low temperatures in cryo-sleep. Cryo-sleep is almost always fatal without the use of cytoprethaline.{{Ref/Reuse|Enc09}}{{Ref/Reuse|Enc11}} The only exceptions is SPARTAN-IIs where they can head straight to cryo-sleep without Cytoprethaline due to their augmentations.

==Allergic reactions==
However, 1 in 50,000 people exhibit an allergic reaction to this drug; those that do are disqualified from [[United Nations Space Command|UNSC]] service or discharged if discovered after entering training, but can still serve in [[civilian]] roles attached to the UNSC.{{Ref/Reuse|Enc09}}{{Ref/Reuse|Enc11}} [[Thomas Lasky]] is one of the few people to be diagnosed with this allergy, which was to be grounds for his discharge from [[Corbulo Academy of Military Science]]; however, the school [[Battle of Circinius IV|was attacked]] by the [[Covenant]] before Lasky was shipped out.{{Ref/Reuse|FUD3}}

An allergic reaction to cytoprethaline results in blistering, peeling, or red skin rashes. Itching or hives, as well as swelling in the face, hands, or feet are other common allergic reactions. Swelling, or at least tingling, can also occur in throat or mouth. Trouble breathing, shortness of breath, chest tightness, cold sweat, and bluish-colored skin are common, severe results from a cytoprethaline allergic reaction. Sudden or severe headaches, or dizziness or problems with speech or with walking are other reactions.{{Ref/Reuse|waypoint}}

==List of appearances==
*''[[Halo 4: Forward Unto Dawn]]'' {{1st}}
*''[[Halo 5: Guardians]]'' {{Mo}}

==Sources==
{{Ref/Sources}}

[[Category:Drugs]]
[[Category:Cryogenics]]