1 If you are pregnant and have never had chickenpox, and you get chickenpox during the:  First half (about 20 weeks) of your pregnancy, there is a very slight risk (0.4% to 2%) for birth defects or miscarriage.
Certain medications can also cause leg cramps. These include: 1  High blood pressure drugs. 2  Statins to treat high cholesterol. 3  Medications for chronic obstructive pulmonary disease (COPD).
Leg cramps are common. The cause is not known in most cases. However, some medications and diseases sometimes cause leg cramps. Regular calf stretching exercises may prevent leg cramps. Quinine tablets may be advised as a last resort if you have cramps regularly.A leg cramp is a pain that comes from a leg muscle.eg cramps are common. The cause is not known in most cases. However, some medications and diseases sometimes cause leg cramps. Regular calf stretching exercises may prevent leg cramps. Quinine tablets may be advised as a last resort if you have cramps regularly.