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Clarithromycin is also known as klacid. It was discovered during research into the structure of erythromycin. It belongs to a class of drugs called macrolide antibiotics.

It is white or off-white crystalline powder; it is odourless and bitter. It has a different solubility in organic solvents but is insoluble in water. It works by stopping the growth of bacteria.

It can make it from erythromycin. The reaction process includes the reaction with iodomethane in dimethyl sulfoxide and tetrahydrofuran and benzyl chloroformate to make Clarithromycin.

Compared with erythromycin, it has a better antibacterial effect on Gram-positive bacteria such as Streptococcus spp, Pneumococcus and Staphylococcus.

Clarithromycin is prescribed for infections by certain bacteria, including those affecting the respiratory tract, 피부, and female genital organs.

It is also used with other medications to prevent Mycobacterium avium complex (MAC) infection in people who have HIV/AIDS.

It may also use it for other purposes, such as surgery or certain types of cancer. It is also used to prevent pneumonia and other infections in people with a weakened immune system caused by chemotherapy, radiation, or steroids.

In vitro antibacterial activity, it is similar to that of erythromycin. They are also cross-resistant, but in some bacteria, Clarithromycin is the superior choice.