Examples of Price Elasticity of Demand. If the quantity purchased changes more than price change (say, 10%/5%), the product is termed elastic. If the change in quantity purchased is the same as the price change (say, 10%/10% = 1), the product is said to have unit (or unitary) price elasticity.
Wellbutrin had side effects at the beginning-the worst of which were insomnia and constipation. The insomnia abated after about 3 weeks of treatment and I take a fiber supplement to deal with the constipation. It also abates with time but never completely goes away.
Wellbutrin is chosen in preference over other antidepressants because its use is less likely to cause weight gain or sexual dysfunction. However, it does carry a risk of inducing seizures; this seizure risk forced the drug off the market for a short time and the recommended dosage was suitably reduced.