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.
If Tylenol or generic acetaminophen do not work, ask your doctor about using a stronger prescription painkiller, such as Ultram (generic tramadol) for a short time. 1  If you have kidney problems, do not take more than 200 mg a day. 2  And take it once every 12 hours to limit the risk of side effects.