Symptoms of overdose can be similar to the medication’s side effects but are usually more severe. Patients exhibiting any of the following symptoms should contact their physician immediately:

• High or low blood pressure
• Irregular heartbeat
• Severe stomach cramps or diarrhea
• Confusion
• Dizziness or fainting
• Fast breathing
• Panic
• Hallucinations
• Hostility or irritability
• Nausea or vomiting
• Restlessness
• Shaking
• Weakness or fatigue

Pregnant or breastfeeding women are advised not to take diet pills. When taken during pregnancy, these drugs could cause withdrawal symptoms or even birth defects when taken in large doses. Some diet pills can also produce harmful effects in a child by passing through breast milk.

In general, women who are pregnant or nursing should consult a physician before taking any prescription or over-the-counter medication.

In general, physicians do not recommend diet pills for use in children. Despite the significant problems associated with childhood obesity, these drugs have not yet been approved for children under the age of 18.

Researchers have not yet examined the effects of diet pills on the elderly. Older patients may metabolize substances such as diet pills differently from younger adults and may be more likely to experience side effects.