Pills for weight loss typically meet their objectives by having a specific affect on the body, such as:

  • Raising the body’s metabolism
  • Suppressing the appetite/desire for food
  • Binding to carbohydrates to prevent them from entering the blood stream.

These pills and supplements may also have side effects that may have an adverse impact on a person’s health. Here are some of the more common pills and supplements and their side effects.

It should be noted that many supplements are not verified to be safe by the FDA, and it’s best to err on the side of caution and consult your physician before taking any pills or supplements.

D4 Thermal Shock Diet Pills

This pills are known as thermogenic, which means they raise your body temperature. This speeds up your metabolism and burns more calories. You burn even more calories by exercising. While this can greatly speed up the amount of calories that you burn, they are known to have the following potentially dangerous side effects:

  • Tingling or prickling sensation
  • Paranoia – levels of alertness raise to an extreme level

These side effects are increased when pills are taken in excess.


Xenical blocks fat from being absorbed by the body, which is helpful for weight loss. Potentially adverse side effects include:

  • Reduced absorption of vitamins A, D, E and K
  • Oily stools
  • Gas
  • Frequent bowel movements


Phentermine requires a prescription and works to suppress the appetite. Phentermine stimulates the nervous system, which induces the sensation of feeling full with less food. Potentially dangerous side effects include:

  • Increased blood pressure
  • Increased heart rate
  • Complications in people with heart or thyroid conditions


Alli works by absorbing fat by binding itself to fat cells in order to allow them to pass out of the body before being absorbed. Adverse side effects include:

  • Gas
  • Cramping Pains
  • Oily Diarrhea


Hoodia suppresses the appetite and makes it easier to stick to a reduced calorie diet with less cravings for food. Doctors have the following concerns about this supplement:

  • It has not been thoroughly studied and its effects are not well known
  • It can lead to dehydration
  • Unknown interactions for people taking prescription medication, ill, or women who are pregnant

While there is no objective scientific proof that shows the appetite suppressing effect is one hundred percent effective, there are no known side effects either, making it safe to experiment with and find out its effectiveness for oneself.

Estrin & Akavar 20/50

These pills are targeted toward menopausal women have effects similar taking large amounts of caffeine. The effects of this supplement are not well known, but may have adverse side effects similar to caffeine such as elevated blood pressure and heart rate.

Green Coffee Beans Extract

Green coffee bean extract contains chlorogenic acid, not found in roasted beens. Chlorogenic acid is reported to increase metabolism and reduce absorption of fat. The risk of this supplement is that there has been very little study of its potential side effects

Many supplements have not been approved by the FDA as safe for consumption. Newer supplements in particular may not have been studied and their effects may not be well known.