Doxycycline is a semi-synthetic antibiotic of a broad spectrum of tetracyclines. Causes bacteriostatic action by suppressing protein synthesis of pathogens as a result of blocking the aminoacyl transport RNA (tRNA) with the "information RNA (rRNA) complex" ribosome.

Avalide is an effective medicine which aim is to lower the blood pressure. Hypertension provokes serious diseases as strokes, heart attack, and problems with the kidney. An angiotensin receptor blocker and diuretic are the basic components of the drug. The first one relaxes the walls of the blood vessels letting the blood move freely without the pressure. The second component stimulates urination so that a patient can get rid of extra salt and water which also provoke high blood pressure.