Once you have started taking these particular tablets (which are calcium channel blockers) it is advised that you should not suddenly stop them - GP's generally seem to recommend you reduce the dosage gradually over a few days if you are having bad effects. Just about every medication has possible side effects which don't affect everyone ! I was on this particular drug but had trouble sleeping (I kept having nightmares) so my GP changed my meds to Perindopril (an ACE inhibitor) - no problems with them whatsoever ! Everyone is different so if you don't get on with the amlodipine, go back to your GP and tell them so, there are loads of different meds for hypertension out there (plus since you will probably have to take them for the rest of your life, it is important that they suit you!)