Nylidrin (Oral)

Nylidrin is one of a group of medicines that are commonly called vasodilators. This medicine is used to treat the symptoms of restricted blood circulation.


Nylidrin is a prescription only medication that comes in tablet form. It should be noted by patients that this drug is no longer legally available in the US, although it may still be used in other countries. This drug is only available on a doctor's prescription.

This medication belongs to a family of drugs called vasodilators. Vasodilators are used to treat patients who have circulatory problems due to constricted or blocked blood vessels. The medicine works by causing the damaged blood vessels to dilate, thus improving blood flow.

Conditions treated

  • Poor blood circulation

Type of medicine

  • Vasodilator
  • Tablet

Side effects

In addition to the effects it is designed to have, some drugs can cause a number of undesirable or unexpected effects. Although not every patient who is taking nylidrin will experience any ill effects when using this drug, if side effects do occur, further medical attention may be necessary.

You should check with your GP right away if you are affected by any of the side effects that are mentioned below:

  • Weakness or tiredness (continuing)
  • Fast or irregular heartbeat
  • Dizziness

When taking your prescribed dose of nylidrin, you should take care not to take too much. The following are symptoms of nylidrin overdose. If you think that you may have taken too much of your medication, check with your treating physician right away:

  • Metallic taste
  • Fever
  • Decrease in urination or inability to urinate
  • Chest pain
  • Blurred vision

There are a number of side effects that patients who are taking nylidrin sometimes report that resolve themselves, without requiring further medical consultations. These effects usually disappear during treatment, once your body has become accustomed to the new drug. In addition, your treating physician may be able to offer you a few ideas on how you can prevent or reduce some or all of the unwanted effects.

If you notice any of the effects that are noted below and they prove to be persistent or particularly bothersome, you should mention them to your GP.

  • Trembling
  • Nervousness
  • Nausea and vomiting
  • Headache
  • Flushing or red face
  • Chilliness

This list of side effects is not necessarily exhaustive and you may notice a few other effects that are not mentioned here. In this case, you should speak with your treating physician right away.


Nylidrin may cause some patients to develop a very rapid or pounding heartbeat. In order to prevent this from causing problems with sleeping, do not take your last dose close to bedtime. Try to plan your schedule of doses in such a way that your sleep patterns will not be affected. Your treating physician will be able to help you to plan a suitable dosing regimen.

The dose of this drug will vary among different patients. Be sure to keep to the directions given to you by your treating physician or follow the instructions on the product label. The information contained in this guide is based on the average dose for this medication. If you have been given a different dose, you must not change it unless you are told to by your doctor.

Your dose of nylidrin that you are told to take will depend on the potency of the preparation. In addition, the quantity of daily doses and the time you must allow between each one will depend on your medical condition and how your body responds to the drug.

Oral dosage tablets:

  • Adults: Take 3 mg to 12 mg three to four times daily.

Nylidrin works best when there are constant levels of the drug in your body. Try to space out your doses of the medicine evenly so that levels remain stable.

If you feel much better after a few days of taking the drug, you must not reduce the dose or stop taking it. If you think your condition is getting worse, check with your GP as soon as possible.

If you forget to take a dose of your medication, you should try to take it right away. However, if your next dose is due, leave it out and return to your usual dosing regimen. Do not take two doses at once to try to catch up.


Drug interactions

Some medications must never be taken at the same time, as this could cause an interaction between them. If this applies in your case, your doctor may decide to alter the dose that you are taking or may advise of other precautions that you could take to manage the interactions.

You must tell your doctor if you are taking any other form of medicine, including over the counter products, herbal preparations, vitamin supplements, and diet pills.

Other interactions

Some medicines must not be used when you are eating or when you are consuming certain foodstuffs. In addition, the use of alcohol or tobacco can interfere with the way some drugs work, causing interactions that could be harmful. Discuss how this could affect your use of nylidrin with your doctor.

Medical interactions

Some historical and existing medical conditions can affect the way in which nylidrin works. Be sure to discuss your medical history fully with your treating physician before you begin using this drug.

Nylidrin should be used with caution in patients with any of the following conditions, as doing so could make these conditions worse:

  • Stomach ulcer
  • Overactive thyroid gland
  • Recent heart attack or other heart disease
  • Fast heartbeat
  • Angina (chest pain)


Before you decide to take any medications, you should consider the risks against the benefits it could bring. This decision will be made following a discussion with your treating physician. In the case of nylidrin, you should consider the following comments in this guide:


You must mention to your treating physician if you have ever had a bad reaction to nylidrin or to any other prescription or over the counter medicines. You should also mention any allergies that you know you have to food colors, preservatives, particular food groups, or animal derivatives.


There is no evidence to show that elderly patients would be adversely affected by the use of nylidrin. However, it should be noted that this medication may reduce the tolerance of elderly people to very cold temperatures. Discuss any concerns that you have in this regard with your doctor.

Pregnancy and breastfeeding

There have been no studies or research papers to show that nylidrin could pose a danger to the unborn baby. Pregnant women may wish to discuss their use of this drug with their doctor if they have any concerns.

Nylidrin is not known to pass into breast milk where it could be consumed by a nursing infant. However, if you are breastfeeding and you are worried about that this medication could have on your child, you should mention it to your doctor or midwife.

Medical complications

Nylidrin can take some weeks to get into your system and begin to work properly. Do not stop taking the drug, even if you think that it is not working. If you are concerned at all, you should check with your treating physician.

The efficacy of this drug can be decreased in patients who are smokers. If you are a smoker, talk to your doctor about ways in which you could quit.


Nylidrin should be kept in the container it is supplied in, sealed, and at room temperature. Keep the medicine away from heat sources, and do not place the container in direct sunlight. Do not freeze the medicine. Do not allow the tablets to get damp.

Keep your prescription of nylidrin out of reach of pets and children. If a pet does eat any of your tablets, you must contact your vet as soon as possible.

If your tablets become out-of-date, are damaged, or if you are no longer taking nylidrin, be sure to dispose of the drugs properly. Do not throw the tablets down the drain, flush them down the toilet, or discard them in the trash where children or pets could find them. Ask your pharmacist or doctor to dispose of the unwanted medicine for you.


Nylidrin is a vasodilator medication that is used to treat circulatory disorders in some patients. The drug works by causing constricted blood vessels to become more dilated, allowing the patient's blood to flow more freely.

Nylidrin can cause some side effects. Throughout the course of your treatment with this medicine, you will therefore need to see your treating physician regularly so that your progress on this drug can be monitored and any side effects can be discussed and remedied.

It should be noted that this drug is no longer available in the US. However, patients in other countries may still be treated with this medicine.