Immediate effects Many people have experienced the following effects soon after taking ecstasy: increase in confidence feelings of well being feelings of closeness to others, hence the term "love drug" dilated pupils sweating jaw clenching, teeth grinding increase in heart rate, body temperature and blood pressure anxiety nausea loss of appetite Higher doses Higher quantities don't appear to enhance the desirable effects and may cause: convulsions (fits) vomiting floating sensations irrational or bizarre behaviour hallucinations