Decongestants are special medicines that provide temporary relief from the nasal congestion. They may be one of the most effective forms of drugs in easing the breathing process, but one cannot be choose to ignore the side effects of this highly powerful medication. These medications, if not taken in the desired quantity can trigger serious heart diseases. This is the reason why every pack of this medication carries a strict warning of its inappropriate use by heart patients and expecting mothers. This medicine basically shrinks the swelling around the vessels and drains the mucus out of the nose. Unfortunately, the role of this medication is not restricted at the nasal area only. Research has found that this medicine tightens the blood vessels of the entire body which results into an increased blood pressure. Due to the decreased size of the vessels, the supply of blood to the heart gets drastically reduced. In extreme cases, this condition results into angina attacks, heart attacks, heart strokes and narrowing of arteries. However, mild medication of decongestants can be taken by heart patients, diabetics, blood pressure patients only after a consultation with the doctor. Those who experience restlessness and heart palpitations after the dosage of this medicine must visit their doctor immediately.