The side effects ingredients in cold medications include:

Phenyl pro panolamin in drug concentration also exceeded the safety threshold.

-  phenyl pro panolamin : causing high blood pressure, arrhythmias, chest pain, loss of appetite. Phenyl pro panolamin content in the cold treatment is usually 25 mg - high threshold level of safety.

That is simply taking from two or more members phenylpropanolamin overdose. But in the manual to record the dose 1-2 capsules / time. 

According to the study of Bach Mai hospital, patients taking two tablets / times have high blood pressure symptoms in addition to other clinical manifestations. One thing of particular note is the drug Medicolac, phenylpropanolamin content is 75 mg, 3 times higher than safe levels.

- Dextromethorphan : There are many neurological side effects (increased irritability, speech impairment, tremor), eyes (nystagmus, pupil size changes), sweating, increased blood pressure.

- Chlorpheniramine : Increased body temperature, increased heart rate, may have cardiogenic shock, ventricular arrhythmias, cardiac arrest, causing hallucinations. The most common side effects are causing tachycardia, mydriasis, paralytic ileus, urinary retention. 

The recommendations of the researchers, should closely monitor the activities of advertising and distribution of flu medication and sleeping pills. The use of these drugs have a doctor's appointment. In addition, manufacturers should also reduce the concentration of the ingredients in the drug, especially phenylpropanolamin.