Low blood pressure: This drug may lower your blood pressure. This can cause lightheadedness, dizziness, and fainting when you stand up. This is called orthostatic hypotension. It may happen as soon as you take the drug. You should sit down while taking this medication and then stand up slowly. Your doctor may check your blood pressure before and during your treatment with this drug.
Nitroglycerin sublingual tablet is a prescription drug that’s available as the brand-name drug Nitrostat. It’s also available as a generic drug. Generic drugs usually cost less. In some cases, they may not be available in every strength or form as the brand-name version.
You let the sublingual tablet dissolve under your tongue or inside of your cheek. Nitroglycerin is also available as a spray, aerosol solution, extended-release oral capsule, transdermal patch, and ointment. It is also available in a form that is injected into a vein that is only given by a healthcare provider.
Why it's used
Nitroglycerin is used to treat angina (chest pain). Angina is a pain or discomfort that happens when part of your heart does not get enough blood. It feels like a pressing or squeezing pain. It can happen in your chest, neck, arms (usually the left one), and lower jaw.
How it works
Nitroglycerin belongs to a class of drugs called vasodilators. A class of drugs is a group of medications that work in a similar way. These drugs are often used to treat similar conditions.
This drug works by relaxing the smooth muscle and blood vessels in your body. This increases the amount of blood and oxygen that reaches your heart. In turn, your heart works less hard. This reduces chest pain.
This drug can cause dizziness during the first few hours after you take it. You shouldn’t drive or use machinery until you know how this medication affects you. This drug can also cause other side effects.
More common side effects
The more common side effects of nitroglycerin can include:
- fast heart rate
- flushing (reddening and warming of your skin)
If these effects are mild, they may go away within a few days or a couple of weeks. If they’re more severe or don’t go away, talk to your doctor or pharmacist.
Serious side effects
Call your doctor right away if you have serious side effects. Call 9-1-1 if your symptoms feel life-threatening or if you think you’re having a medical emergency. Serious side effects and their symptoms can include the following:
- Low blood pressure. Symptoms can include:
- dizziness or lightheadedness
- blurry vision
- cold and clammy skin
- fast and shallow breathing
Disclaimer: Our goal is to provide you with the most relevant and current information. However, because drugs affect each person differently, we cannot guarantee that this information includes all possible side effects. This information is not a substitute for medical advice. Always discuss possible side effects with a healthcare provider who knows your medical history.
Nitroglycerin sublingual tablet can interact with other medications, vitamins, or herbs you may be taking. An interaction is when a substance changes the way a drug works. This can be harmful or prevent the drug from working well.
To help avoid interactions, your doctor should manage all of your medications carefully. Be sure to tell your doctor about all medications, vitamins, or herbs you’re taking. To find out how this drug might interact with something else you’re taking, talk to your doctor or pharmacist.
Drugs you should not use with nitroglycerin
Do not take certain drugs with nitroglycerin. Doing so can cause dangerous effects in your body. Examples of these drugs include:
- Sildenafil, tadalafil, and vardenafil. Taking any of these drugs with nitroglycerin can cause very low blood pressure.
- Ergotamine. Taking these drugs together can cause more chest pain.
- Riociguat. Taking these drugs together can cause very low blood pressure.
Interactions that can make your drugs less effective
When you take nitroglycerin with certain drugs, nitroglycerin may not work as well to treat your condition. This is because the amount of nitroglycerin in your body may be decreased. Examples of these drugs included drugs used to treat depression such as:
These drugs may cause dry mouth and decrease the amount of saliva your mouth makes. This can make it harder for the tablet to dissolve in your mouth. This means that the drug may not work as well to treat your chest pain.
Disclaimer: Our goal is to provide you with the most relevant and current information. However, because drugs interact differently in each person, we cannot guarantee that this information includes all possible interactions. This information is not a substitute for medical advice. Always speak with your healthcare provider about possible interactions with all prescription drugs, vitamins, herbs and supplements, and over-the-counter drugs that you are taking.
Nitroglycerin sublingual tablet comes with several warnings.
Drinking alcohol can increase your risk of very low blood pressure from this drug. If you drink alcohol, talk to your doctor.
Allergic reactions to nitroglycerin are extremely rare, but they do occur. Symptoms can include:
- trouble breathing
- swelling of your throat or tongue
If you have an allergic reaction, call your doctor or local poison control center right away. If your symptoms are severe, call 911 or local emergency services or go to the nearest emergency room.
Don’t take this drug again if you’ve ever had an allergic reaction to it. Taking it again could be fatal (cause death).
Warnings for people with certain health conditions
For people with a history of heart attack or heart failure: It isn’t known if this drug will help you during a heart attack. A heart attack may cause severe, crushing pain that comes on suddenly. If you have signs of a heart attack, call 9-1-1 right away. It also isn’t known if this drug helps people with congestive heart failure. If you use this drug in this situation, it may lower your heart rate and blood pressure.
Warnings for other groups
For pregnant women: Nitroglycerin is a category B pregnancy drug. That means two things:
- Research in animals has not shown a risk to the pregnancy when the mother takes the drug.
- . There aren’t enough studies done in humans to show if the drug poses a risk to the pregnancy.
Talk to your doctor if you’re pregnant or planning to become pregnant. Animal studies do not always predict the way humans would respond. Therefore, this drug should be used in pregnancy only if clearly needed. Call your doctor right away if you become pregnant while taking this drug
For women who are breastfeeding: Nitroglycerin may pass into breast milk and cause side effects in a child who is breastfed. Talk to your doctor if you breastfeed your child. You may need to decide whether to stop breastfeeding or stop taking this medication.
For children: This medication has not been studied in children. It should not be used in people younger than 18 years.
This dosage information is for nitroglycerin sublingual tablet. All possible dosages and drug forms may not be included here. Your dosage, drug form, and how often you take the drug will depend on:
- your age
- the condition being treated
- how severe your condition is
- other medical conditions you have
- how you react to the first dose
Forms and strengths
- Form: sublingual tablet
- Strengths: 0.3 mg, 0.4 mg, 0.6 mg
- Form: sublingual tablet
- Strength: 0.3 mg, 0.4 mg, 0.6 mg
Dosage for angina (chest pain)
Adult dosage (ages 18 years and older)
- You should use the smallest dose that works to relieve your chest pain. Taking more of this drug than you need can lead to tolerance. This means that, over time, the drug may not work as well to treat your chest pain.
- Dissolve your dose under your tongue or in your cheek at the first sign of chest pain.
- You can repeat the dose once every 5 minutes until your chest pain gets better.
- If you’re still in pain after taking 3 doses in a 15-minute period, call 9-1-1 right away. You should also call 9-1-1 if your chest pain is different from normal.
Child dosage (ages 0–17 years)
This medication has not been studied in children. It should not be used in people younger than 18 years.
Disclaimer: Our goal is to provide you with the most relevant and current information. However, because drugs affect each person differently, we cannot guarantee that this list includes all possible dosages. This information is not a substitute for medical advice. Always to speak with your doctor or pharmacist about dosages that are right for you.
Take as directed
Nitroglycerin sublingual tablet is used for short-term treatment. It comes with serious risks if you don’t take it as prescribed.
If you don’t take it at all: If you don’t take this drug at all, you may have severe chest pain.
If you miss doses or don’t take the drug on schedule: This drug is not meant to be taken on a schedule. Take it only when you have chest pain.
If you take too much: You could have dangerous levels of the drug in your body. Symptoms of an overdose of this drug can include:
- throbbing headache
- vision problems, such as trouble seeing, blurry vision, and double vision
- shortness of breath
- cold or clammy skin
If you think you’ve taken too much of this drug, call your doctor or local poison control center. If your symptoms are severe, call 911 or go to the nearest emergency room right away.
What to do if you miss a dose: This drug is not meant to be taken on a schedule. Take it only when you have chest pain.
How to tell if the drug is working: Your chest pain should get better.
Keep these considerations in mind if your doctor prescribes nitroglycerin sublingual tablets for you.
- Do not take this drug with food.
- Take this drug only when you have severe chest pain.
- Do not crush, chew, or cut this tablet.
- Store nitroglycerin at room temperature. Keep it between 59°F and 86°F (15°C and 30°C).
- Keep this drug away from light.
- Store this drug in the glass bottle it comes in. Close the cap well after each use.
- Don’t store this medication in moist or damp areas, such as bathrooms.
A prescription for this medication is refillable. You should not need a new prescription for this medication to be refilled. Your doctor will write the number of refills authorized on your prescription.
When traveling with your medication:
- Always carry your medication with you. When flying, never put it into a checked bag. Keep it in your carry-on bag.
- Don’t worry about airport x-ray machines. They can’t hurt your medication.
- You may need to show airport staff the pharmacy label for your medication. Always carry the original prescription-labeled box with you.
- Don’t put this medication in your car’s glove compartment or leave it in the car. Be sure to avoid doing this when the weather is very hot or very cold.
To take this drug, place it under your tongue or on the inside of your cheek. Don’t swallow the drug. Instead, let it dissolve. Do not eat or drink anything until the drug has completely dissolved. If you smoke, don’t smoke until the drug has fully dissolved.
Your doctor may have you check your blood pressure and heart rate at home. You may need to buy your own blood pressure monitoring machine to do this. You should keep a log of the date, time of day, and blood pressure readings. Bring this journal with you to your checkups.
This drug may lower your blood pressure and heart rate. Your doctor may check your blood pressure and heart rate before and during your treatment. They may also ask you to check your blood pressure and heart rate at home. If your blood pressure and heart rate drop too low, your doctor may reduce your dosage, stop your treatment, or give you a different form of nitroglycerin.
You may need to purchase a blood pressure monitor to check your blood pressure at home.
There are other drugs available to treat your condition. Some may be better suited for you than others. Talk to your doctor about other drug options that may work for you.
Disclaimer: Healthline has made every effort to make certain that all information is factually correct, comprehensive, and up-to-date. However, this article should not be used as a substitute for the knowledge and expertise of a licensed healthcare professional. You should always consult your doctor or other healthcare professional before taking any medication. The drug information contained herein is subject to change and is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. The absence of warnings or other information for a given drug does not indicate that the drug or drug combination is safe, effective, or appropriate for all patients or all specific uses.