Caffeine is a naturally-occurring central nervous system stimulant that can help boost your energy levels, allowing you to remain alert and focused. Natural forms of caffeine can be found in certain foods, such as coffee and tea. Alternatively, synthetic or man-made forms of caffeine may be found in over-the-counter or prescription pills. You should be aware of the harmful effects of caffeine pills before using this energy supplement.
Restlessness, Nervousness, Anxiety or Irritability
Taking caffeine pills may induce unusual feelings of restlessness, nervousness, anxiety or irritation. You may feel uncomfortably jittery or shaky, which may disrupt your ability to focus or concentrate on your normal daily activities.
Insomnia
Feelings of restlessness or nervousness may affect your ability to fall asleep or stay asleep through the night -- a harmful effect of caffeine called insomnia, the Center for Young Women's Health reports. Insomnia may also lead to increased daytime fatigue, which can make it difficult for you to remain active throughout the day. Talk with your doctor if insomnia persists for more than a couple of days.
Dizziness
After taking caffeine pills, you may feel unusually dizzy or lightheaded. If you experience an episode of dizziness, remain seated until the sensation passes. Attempting to stand or walk about normally while you are feeling dizzy may increase your risk of sustaining an injury from tripping or falling down.
Upset Stomach
Central nervous system stimulants, such as caffeine pills, may irritate your stomach or digestive tract. Consequently, you may feel nauseous or begin vomiting, Drugs.com reports. Stomach irritation may also cause frequent bowel movement urges, called diarrhea, that yield loose or watery stools. Consult your physician if you experience severe stomach upset or persistent diarrhea.
Increased Urination
Increased urination may occur as a harmful effect of caffeine pills, KidsHealth explains. Caffeine is a diuretic that causes fluid loss by increasing your urinary frequency. Increased urination may be bothersome and may disrupt your normal sleeping patterns. Contact your medical provider if you experience increased urination in conjunction with unintended weight loss or pain as such harmful effects may be indicative of alternate health issues such as diabetes or a bladder infection.
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