If you take a large amount of these drugs you might:

• Get headaches
• Have repetitive behaviours such as grinding your teeth
• Feel dizzy
• Feel restless
• Shake
• Have irregular breathing
• Have a very fast, irregular heart beat
• Become pale due to changes in your blood pressure
• Sweat profusely
• Feel very powerful or that you are better than others
• Have a loss of inhibitions
• Become hostile or aggressive
• Have psychosis - a serious psychological problem where you may hear voices, imagine things that you think are real, esperience paranoia, fear that others are 'out to get you' or that others want to hurt you.