The unbound drug is that fraction  of drug in plasma or tissues that is no bound to plasma or tissue proteins. A reversible equilibrium normally exists between the unbound drug and the protein bound drug. Only the unbound drug is considered to be pharmacologically active and in equilibrium with the receptor site. This fraction appears to be responsible for the dose-related therapeutic effects and adverse reaction. The unbound fraction is also available for excretion and elimination.

Certain drugs have a marked hepatic uptake that is capable of rapidly shifting the equilibrium from bound to unbound drug. This creates the effect of so called protein stripping by the liver. For these drugs increased protein binding results in enhanced hepatic clearance. Changes in their rate of metabolism depend mainly on hepatic blood flow. For other drugs an increase in unbound drug generally leads to increased hepatic metabolism. The rate of metabolism of such drugs is normally independend of liver blood flow. Protein binding limits glomerular filtration but generally does not influence renal tubular secretion, which also appears to strip bound drug.

There are, understandably, a number of possible complications of pregnancy, especially in teenage pregnancies. Among others, these include certain infections, anemia, trimester bleeding, hyperemesis gravidarum (pernicious nausea and vomiting), eclampsia (coma and/or convulsive seizure), erythroblastosis fetalis (Rh factor incompatibility), ectopic pregnancy (implantation outside the uterine cavity), and spontaneous abortion (miscarriage).

By convention, abortion is defined as delivery or loss of the product of conception before the twentienth week of pregnancy. About 35 % of women bleed or have cramping sometime during the first 20 weeks of pregnancy; about 20% actually abort. Since in 90 % of spontaneous abortions the fetus is either absent or grossly malformed, and in an additional 5% it has chromosomal abnormalities, spontaneous abortion may be a natural, purposeful rejection. If a woman has three or more successive pregnancies that end in spontaneous abortion, she is said   to have habitual abortion.

Toxic shock syndrom is a illness that primarily affects young women using tampon during menstral periods. Because a particular brand of tampon was statistically associated with many cases, that product was withdrawn from the market. Other manufacturers are now supplying warning on or inside tampon packages to alert the estimated 50 milliom American women who use tampons to the possible danger. It should be stressed, however, that TSS is a rare disease with, at most, 15 cases per 100,000 menstruating women per year.

Cases of toxic syndrome not associated with menstruation account for about 13 % of the total reported cases. Among those affected are postsurgical patients, burn patients, women who have just given birth, and patients with boils or abscesses. In a few persons the disease has occured without any apparent preexisting medical condition.

Justin Bieber is phenomenon. After gaining thousands of fans on his home-made singing video in YouTube, this Canadian-born R&B singer has now become world’s idol. In fact, he has achieved the multi platinum for his debut album, all his 7 songs are hits and in 100 chart in Billboard’s. Today, Justin is another influential icon for many fans especially the teens and he speaks for his fans for being Proactiv.

It is approved that Proactiv is the number one acne system that helps people with acne problems to get healthier and more beautiful skin. Since the teen age is the sensitive period for breakouts to come, Proactiv would suggest many teens to use this product to reduce and prevent breakouts. Thus, Justin Bieber is Proactiv and he has become Proactiv’s spokesperson.

This brand is specially engineering the new and first Proactiv kit for teens and provides then astonishing care system through 3-step system which are Cleanser, Toner, and Repairing Treatment, and of course new improved solutions to treat the stubborn breakouts.