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.
Acetaminophen (Tylenol) is an analgesic pain reliever that can help mild to moderate osteoarthritis pain. Acetaminophen works differently than other pain relievers. Though it's exact mode of pain relief isn't completely understood, it is believed that acetaminophen raises the threshold for pain.cetaminophen works differently than other pain relievers. Though it's exact mode of pain relief isn't completely understood, it is believed that acetaminophen raises the threshold for pain.