It is a good idea to treat just the symptoms that you have.
If you have only a runny nose, don’t choose a medicine that also treats headache and .
However, if you take the older (first generation), sedating antihistamines in higher doses for a prolonged time, you run the risk of physical dependence and addiction, as well as more severe adverse side effects.
These were some of the first antihistamines scientists developed. They also work in the part of the brain that controls . One of the most common side effects of first-generation antihistamines is feeling sleepy.
For this reason, they are sometimes used to help people who have trouble sleeping (insomnia).
In November 2000, the Food and Drug Administration (FDA) issued a public health warning regarding phenylpropanolamine (PPA) due to the risk of hemorrhagic stroke.
The FDA, supported by results of a research program, requested that manufacturers voluntarily discontinue marketing products that contain PPA and that consumers work with their healthcare providers to select alternative products.