As Astro (loved your work on 'The jetsons, by the way) said, CCBs are commonly prescribed for high blood pressure. They're also sometimes prescribed for migraine headaches, cardiac arrhythmias and sometimes angina. CCBs dilate blood vessels and decrease both heart rate and the strength of heart contractions, as well as decreasing electrical conduction through the heart. These can be good things when you need to control blood pressure or protect a heart from overexertion. Obviously too much of any of these effects can be a very bad thing. Prescribed properly though, they're generally a safe, effective med.
One glitch to be aware of with either CCBs or beta blockers like propranolol is that your heart rate won't be nearly as responsive to greater demands, such as with sudden exercise.
If you're being prescribed any meds for high blood pressure, it's not a bad idea to monittor and chart your blood pressure and heart rate on a daily basis at home for the first few weeks. Such information can really help your doc fine tune your dosage. CCBs can also screw with your insulin levels, so basic blood testing isn't the worst idea.
Hope this helps.