Medications that act as stimulants, and many others, can cause fasciculations as a side effect. Stimulant medications increase the activity of dopamine and norepinephrine. These chemicals affect reward-motivated behavior and alertness, respectively. While the chemicals are essential for daily life, any imbalance can result in serious issues. Muscle spasms are a common side effect of stimulant medications. Typically, physicians prescribe stimulants to treat conditions such as ADHD and narcolepsy.

DNY59 / Getty Images
This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.