People with problem of blood pressure take common blood pressure medicines known as calcium channel blockers. They are vulnerable to some antibiotics as these antibiotics will fatally react with the medicine they are taking to control blood pressure.

In a recent study, at Sunnybrook Research Institute in Toronto led by Dr. David Juurlink who is a scientist, it has been revealed the fact.

Dr. David Juurlink said, "Two common antibiotics, erythromycin and clarithromycin, if given to patients taking calcium channel blockers, can increase the risk substantially of being hospitalized for low blood pressure."

The risk jumps 6-fold if a patient who is taking calcium channel blocker takes erythromycin along with it while the risk grow 4-fold with clarithromycin.

Dr. Juurlink added that though the risk of the mixing of these 2 types of medicines has been known for more than 2 decades, the measuring of the quantity of the effects has been found in this study recently.

There is an evidential reason behind such reactions. They interfere with an enzyme in the liver that is required to break down the calcium channel blocker. When this enzyme is neutralised an excessive amount of calcium blocker accumulates in the body and causes the blood pressure to fall drastically. This can presumably act fatally on the patients.