Up to 40% of patients taking clonidine (Catapres) will experience dry mouth and about a third will have drowsiness, headache, and sleepiness. Other common side effects include constipation, dizziness, and local skin reactions with use of the Catapres-TTS skin patch. Reserpine use is linked with possible side effects including nightmares, stuffy nose, depression, and an inability to fall asleep. Diarrhea and heartburn are also possible. Guanadrel and guanethidine can cause diarrhea and other gastrointestinal issues – as well as dizziness and drowsiness.
When was the last time you thought about your blood pressure? If you're like most people, it probably hasn't been since your doctor mentioned it during your last checkup. But high blood pressure (hypertension) is a serious condition that can lead to life-threatening problems, like heart attack and stroke. The good news is that you can lower your risk of hypertension with lifestyle changes.
Beta-blockers cause the heart to slow down and so some of their side effects can be traced to that mechanism of action. Dizziness, weakness, fatigue, and fainting are possible. Beta-blockers also affect the respiratory system, so other side effects include shortness of breath, difficulty breathing, and chest pain. Beta-blockers should not be withdrawn suddenly, as that could result in a heart attack or sudden death.
Often, hypertension can improve with lifestyle changes. In some cases, high blood pressure can go down to normal levels with only lifestyle modifications, particularly if you have stage 1 hypertension (systolic blood pressure of 130 mmHg to 159 mmHg, or diastolic blood pressure 80 mmHg to 99 mmHg), or if you have elevated blood pressure (systolic blood of 120 mmHg to 129 mmHg and diastolic less than 80 mmHg).