There are many physical effects associated with using Meth or Methamphetamines. Because of how it's made, crystal meth is never pure, so the dangers associated with taking the street drug may vary from the effects listed here.

Common effects of meth usage includes:

• Sense of Euphoria
• Temporary increase in energy and alertness
• Diarrhea and nausea
• Excessive perspiration
• Tremors, appetite loss, insomnia and clenching of the jaws
• Agitation, irritability, talkativeness, panic, compulsive fascination with repetitive tasks, violence, confusion
• Temporary increase in libido
• Increased blood pressure, body temperature, heart rate, blood sugar levels, bronchodilation
• In pregnant and nursing women, methampetamine crosses the placenta and is secreted in breast milk
• Orgasmic intensity
• Blurred vision
• Dry mouth
• Dizziness

Effects Associated with Chronic Use of Meth includes:

• Developing tolerance (needing more of the drug to get the same effect)
• Constant craving for Meth 
• Temporary and unhealthy weight loss
• Withdrawal symptoms including depression and anhedonia
• Develop "Meth Mouth" where teeth rapidly decay and fall out
• Drug-related psychosis (may last for months or years after drug use is discontinued)