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Most Commonly Used

Phentermine 37.5mg Tab
KVK-Tech, Inc.
Pill Identification: K 25 
Drug Image
Phentermine 37.5mg Cap
KVK-Tech, Inc.
Pill Identification: K 29 K 29
Drug Image
Phentermine 15mg Cap
KVK-Tech, Inc.
Pill Identification: K 26 K 26 
Drug Image
Phentermine 30mg Cap
KVK-Tech, Inc.
Pill Identification: K 28 K 28 
Drug Image
Phentermine 30mg Cap
KVK-Tech, Inc.
Pill Identification: K 27 K 27 
Drug Image

Also See:

  • Answers to Frequently-Asked Questions (FAQs)
  • Other Class Related Drugs
  • Additional Patient Usage Statistics

Common Side Effects of Phentermine Hydrochloride
Talk with your doctor before you take phentermine with any other medicine. Not all medicines are safe to take with phentermine. Give your doctor a complete list of all your medicines, including over-the-counter medicines, and herbal supplements.

Tell your doctor if you drink alcohol often. Also tell your doctor if you have:
  • Allergies to any medicines
  • Heart problems
  • History of drug abuse
  • Thyroid problems
  • Family history of mental illness
  • Kidney disease
  • High blood pressure
  • Glaucoma
Phentermine may cause you to become dizzy or drowsy. Avoid driving or operating machinery until you know how phentermine affects your ability to remain alert.

Contact your doctor immediately, or call 911 in an emergency, if you suffer an allergic reaction to phentermine. Symptoms may include hives; itching; swelling of your face, lips, hands, mouth, or throat; chest tightness; or trouble breathing.

Other serious side effects of phentermine may include:
  • Tremors or seizures
  • Severe headache
  • Unusual weakness or tiredness
  • Fast, slow, pounding, or uneven heartbeat
More common side effects that phentermine may cause include:
  • Change in sex drive or abilities
  • Confusion, nervousness, restlessness, or unusual behavior
  • Bad taste in your mouth
  • Blurred vision
  • Increased sweating
  • Dry mouth
  • Trouble sleeping
  • Headache, drowsiness, or dizziness
  • Nausea, vomiting, diarrhea, constipation, or stomach cramps
Talk to your doctor if any of these side effects do not go away or worsen while taking phentermine.