It is also sometimes called erythrocytosis, which means too many red blood cells. And it used to be called polycythaemia rubra vera or PCRV. PV is a type of rare blood disorder called a myeloproliferative neoplasm.These are conditions that cause an increase in the number of blood cells.t is also sometimes called erythrocytosis, which means too many red blood cells. And it used to be called polycythaemia rubra vera or PCRV. PV is a type of rare blood disorder called a myeloproliferative neoplasm.
Acetaminophen -- best known as Tylenol in the United States -- does not appear to help ease lower back pain and offers little relief for the most common form of arthritis, according to a new report.
Some people who experience migraine headaches find that Tylenol â Acetaminophen helps relieve migraine pain and for others it can be used to prevent migraines from occurring. Tylenol â Acetaminophen is sold under the names: 1  Tylenol and Tylenol Extra Strength. 2  Acephen. 3  Anacin Aspirin Free Maximum Strength Tablets. 4  FeverAll. 5  Gelpirin. 6  Genapap. 7  Liquiprin Drop. 8  Tylox.