Difference Between Phentermine & Ritalin

Phentermine and Ritalin are central nervous system stimulants with similar effects on blood pressure, appetite and metabolism. Despite their similarities, many differences exist between phentermine and Ritalin, including their indications for use, side effects and legal status.

Uses

• Phentermine is prescribed mainly as a weight-loss medication, while Ritalin is approved for treating ADHD and narcolepsy.

Side Effects

• According to drugs.com, phentermine may cause changes in sex drive, bad taste in the mouth and impotence. Side effects unique to Ritalin include cold or numbness in hands and feet and vision problems.

Pharmacology

• Phentermine is a sympathomimetic amine that primarily affects the neurotransmitter norepinephrine. Ritalin--an amphetamine stimulant--works by increasing levels of noradrenaline and dopamine in the brain, according to rxlist.com.

Legal Status

• Both phentermine and Ritalin are controlled substances. Ritalin is a Schedule II drug, which indicates a high potential for abuse and addiction, while phentermine is a member of the less restrictive Schedule IV class.

Warning

• Stimulants like Ritalin and phentermine can cause life-threatening effects when taken together. To decrease the likelihood of side effects, tell your doctor if you have a history of heart disease, glaucoma or diabetes before taking phentermine or Ritalin.