Using weight-loss pens may cause side effects such as dizziness, nausea, or constipation. Therefore, the use of weight-loss injections should be under the supervision of a doctor to prevent potential complications after treatment.

Weight loss pens vary in price, and it's necessary to consider factors such as brand, manufacturer, clinic promotions, and the number of injections required under a doctor's supervision.

Weight loss pens contain the active ingredient liraglutide, which helps control appetite, leading to effective weight loss with minimal side effects.