I have not taken it, but the serious side effects are:
an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives);
unusually fast or slow heartbeats;
severe dizziness or fainting;
psychosis;
yellowing of the skin or eyes (jaundice); or
swelling of the legs or ankles.
Less serious side effects are:
headache, fatigue, or tiredness;
flushing;
insomnia;
vivid or abnormal dreams;
nausea or constipation; or
increased urination.
=)

1 comment so far ↓
I have not taken it, but the serious side effects are:
an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives);
unusually fast or slow heartbeats;
severe dizziness or fainting;
psychosis;
yellowing of the skin or eyes (jaundice); or
swelling of the legs or ankles.
Less serious side effects are:
headache, fatigue, or tiredness;
flushing;
insomnia;
vivid or abnormal dreams;
nausea or constipation; or
increased urination.
=)
References :
http://www.drugs.com/nifedipine.html