Darvon-N and Darvon are federally controlled substances (C-IV) because they are strong opioid pain medicines that can be abused by people who abuse prescription medicines or street drugs.

Prevent theft, misuse, or abuse. Keep Darvon-N or Darvon in a safe place to protect it from being stolen. Darvon-N and Darvon can be a target for people who misuse or abuse prescription medicines or street drugs.

Never give Darvon-N or Darvon to anyone else, even if they have the same symptoms that you have. It may harm them or even cause death. Selling or giving away this medicine is against the law.

Side Effects Of Darvon-N

Serious breathing problems that can become life-threatening. This is especially true if you already have a serious lung or breathing problem, or your body is not used to opioid pain medicines. This can happen even if you take Darvon-N or Darvon exactly as prescribed by your doctor. Call your doctor or get medical help right away if:

  • your breathing slows down
  • you have shallow breathing (little chest movement with breathing)
  • you feel faint, dizzy, confused, or
  • you have any other unusual symptoms
  • Darvon-N and Darvon can cause your blood pressure to drop. This can make you feel dizzy and faint if you get up too fast from sitting or lying down. Low blood pressure is also more likely to happen if you take other medicines that can also lower your blood pressure. Severe low blood pressure can happen if you lose blood or take certain other medicines.
  • Sleepiness. Darvon-N and Darvon can cause sleepiness and may affect your ability to make decisions, think clearly, or react quickly. Do not drive, operate heavy machinery, or do other dangerous activities until you know how Darvon-N or Darvon affects you.
  • Darvon-N and Darvon can cause physical dependence if you take it for more than a few weeks. Do not stop taking Darvon-N or Darvon all of a sudden. You could become sick with uncomfortable withdrawal symptoms (for example, nausea, vomiting, diarrhea, anxiety, and shivering) because your body has become used to the medicine. Physical dependence is not the same as drug addiction. Your doctor can tell you more about the
    differences between physical dependence and drug addiction.
  • Tell your doctor if you have any of these withdrawal symptoms while you slowly stop taking Darvon-N or Darvon. You may need to stop Darvon-N or Darvon more slowly.

Common side effects of Darvon-N and Darvon include:

  • dizziness
  • weakness
  • feeling sleepy
  • feeling of excitement (elation) or
  • nausea and vomiting discomfort
  • constipation
  • seeing, hearing, or sensing things
  • stomach area (abdominal) pain that is not really there
  • skin rashes (hallucinations)
  • lightheadedness
  • blurred vision

Warnings & Precautions

Do not take Darvon-N or Darvon if you:

  • are allergic to propoxyphene. Ask your doctor if you are not sure. See the end of this Medication Guide for a list of the ingredients in Darvon-N and Darvon.
  • are having an asthma attack or have severe asthma, trouble breathing, or have a lung problem
  • have a bowel blockage called paralytic ileus

Before you take Darvon-N or Darvon, tell your doctor:

  • if you are allergic to propoxyphene
  • if you plan to have surgery with general anesthesia
  • if you are pregnant or plan to become pregnant.
  • if you take Darvon-N or Darvon regularly before your baby is born, your newborn baby may have withdrawal symptoms because their body has become used to the medicine.

Symptoms of withdrawal in a newborn baby may include: irritability

    • crying more than usual
    • shaking (tremors)
    • diarrhea or more stools than jitteriness normal
    • breathing faster than normal
    • vomiting
    • fever
  • if you take Darvon-N or Darvon right before your baby is born, your baby could have breathing problems.
  • if you are breast-feeding or plan to breast-feed. Some Darvon-N or Darvon passes into breast milk.

Tell your doctor about all the medicines you take, including prescription, and nonprescription medicines, vitamins, and herbal supplements. Darvon-N and Darvon interact with many medicines and may lead to serious side effects. The doses of certain medicines may need to be changed.

Dosage Of Darvon-N


  • Active ingredient: propoxyphene napsylate
  • Inactive ingredients: cellulose, cornstarch, iron oxides, lactose, magnesium stearate, silicon dioxide, stearic acid, and titanium dioxide


  • Active ingredient: propoxyphene hydrochloride
  • Inactive ingredients: D & C Red No. 33, FD & C Yellow No. 6, gelatin, magnesium stearate, silicone, starch, titanium dioxide, and other inactive ingredients.


Medicines are sometimes prescribed for purposes other than those listed in a Medication Guide. Do not use Darvon-N or Darvon for a purpose for which it was not prescribed. Do not give Darvon-N or Darvon to others even if they have the same symptoms you have. It may harm them and is against the law. This Medication Guide summarizes the most important information about Darvon-N and Darvon. If you would like more information, talk with your doctor. You can ask your pharmacist or doctor for information about Darvon-N and Darvon that is written for health professionals.


All information has been provided courtesy of MedLinePlus from the National Library of Medicine and from the FDA.