Description and Brand Names

Drug information provided by: Micromedex

US Brand Name

  1. Levatol

Descriptions


Penbutolol is used alone or together with other medicines, including a diuretic or "water pill" such as hydrochlorothiazide (HCTZ) to treat high blood pressure (hypertension). High blood pressure adds to the workload of the heart and arteries. If it continues for a long time, the heart and arteries may not function properly. This can damage the blood vessels of the brain, heart, and kidneys, resulting in a stroke, heart failure, or kidney failure. High blood pressure may also increase the risk of heart attacks. These problems may be less likely to occur if blood pressure is controlled.

This medicine is a beta-blocker. It works by affecting the response to nerve impulses in certain parts of the body, like the heart. As a result, the heart beats slower and decreases the blood pressure. When the blood pressure is lowered, the amount of blood and oxygen is increased to the heart.

This medicine is available only with your doctor's prescription.

This product is available in the following dosage forms:

  • Tablet

Before Using

In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For this medicine, the following should be considered:

Allergies

Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.

Pediatric

Appropriate studies have not been performed on the relationship of age to the effects of penbutolol in the pediatric population. Safety and efficacy have not been established.

Geriatric

Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of penbutolol in the elderly. However, elderly patients are more likely to have age-related liver, kidney, or heart problems, which may require caution and an adjustment in the dose for patients receiving penbutolol.

Pregnancy

Information about this penbutolol-oral-route
Pregnancy Category Explanation
All Trimesters C Animal studies have shown an adverse effect and there are no adequate studies in pregnant women OR no animal studies have been conducted and there are no adequate studies in pregnant women.

Breastfeeding

There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.

Drug Interactions

Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.

Using this medicine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

  • Albuterol
  • Amiodarone
  • Arformoterol
  • Bambuterol
  • Clenbuterol
  • Clonidine
  • Colterol
  • Crizotinib
  • Diltiazem
  • Dronedarone
  • Epinephrine
  • Fenoldopam
  • Fenoterol
  • Fingolimod
  • Formoterol
  • Hexoprenaline
  • Indacaterol
  • Isoetharine
  • Levalbuterol
  • Metaproterenol
  • Pirbuterol
  • Procaterol
  • Reproterol
  • Ritodrine
  • Salmeterol
  • Terbutaline
  • Tretoquinol
  • Tulobuterol
  • Verapamil
  • Vilanterol

Using this medicine with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

  • Acarbose
  • Aceclofenac
  • Acemetacin
  • Acetohexamide
  • Acetyldigoxin
  • Alfuzosin
  • Amlodipine
  • Amtolmetin Guacil
  • Arbutamine
  • Aspirin
  • Benfluorex
  • Bromfenac
  • Bufexamac
  • Bunazosin
  • Celecoxib
  • Chlorpropamide
  • Choline Salicylate
  • Clonixin
  • Deslanoside
  • Dexibuprofen
  • Dexketoprofen
  • Diclofenac
  • Diflunisal
  • Digitoxin
  • Digoxin
  • Dipyrone
  • Doxazosin
  • Etodolac
  • Etofenamate
  • Etoricoxib
  • Felbinac
  • Felodipine
  • Fenoprofen
  • Fepradinol
  • Feprazone
  • Floctafenine
  • Flufenamic Acid
  • Flurbiprofen
  • Gliclazide
  • Glimepiride
  • Glipizide
  • Gliquidone
  • Glyburide
  • Guar Gum
  • Ibuprofen
  • Ibuprofen Lysine
  • Indomethacin
  • Insulin
  • Insulin Aspart, Recombinant
  • Insulin Glulisine
  • Insulin Lispro, Recombinant
  • Ketoprofen
  • Ketorolac
  • Lacidipine
  • Lercanidipine
  • Lidocaine
  • Lornoxicam
  • Loxoprofen
  • Lumiracoxib
  • Manidipine
  • Meclofenamate
  • Mefenamic Acid
  • Meloxicam
  • Metformin
  • Metildigoxin
  • Mibefradil
  • Miglitol
  • Morniflumate
  • Moxisylyte
  • Nabumetone
  • Naproxen
  • Nepafenac
  • Nicardipine
  • Nifedipine
  • Niflumic Acid
  • Nilvadipine
  • Nimesulide
  • Nimodipine
  • Nisoldipine
  • Nitrendipine
  • Oxaprozin
  • Oxyphenbutazone
  • Parecoxib
  • Phenoxybenzamine
  • Phentolamine
  • Phenylbutazone
  • Piketoprofen
  • Piroxicam
  • Pranidipine
  • Pranoprofen
  • Prazosin
  • Proglumetacin
  • Propyphenazone
  • Proquazone
  • Repaglinide
  • Rofecoxib
  • Salicylic Acid
  • Salsalate
  • Sodium Salicylate
  • St John's Wort
  • Sulindac
  • Tamsulosin
  • Tenoxicam
  • Terazosin
  • Tiaprofenic Acid
  • Tolazamide
  • Tolbutamide
  • Tolfenamic Acid
  • Tolmetin
  • Trimazosin
  • Troglitazone
  • Urapidil
  • Valdecoxib

Other Interactions

Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.

Other Medical Problems

The presence of other medical problems may affect the use of this medicine. Make sure you tell your doctor if you have any other medical problems, especially:

  • Anaphylactic reaction (severe), history of—May increase risk for repeated anaphylactic reactions.
  • Angina (severe chest pain) or
  • Heart attack, recent or
  • Heart failure, history of or
  • Heart or blood vessel disease (e.g., coronary artery disease)—Use with caution. May make these conditions worse.
  • Asthma or
  • Bradycardia (slow heartbeat) or
  • Cardiogenic shock (shock caused by heart attack) or
  • Heart block—Should not be used in patients with these conditions.
  • Diabetes or
  • Hyperthyroidism (overactive thyroid) or
  • Hypoglycemia (low blood sugar)—May cover up some of the signs and symptoms of these diseases, such as a fast heartbeat.
  • Kidney disease—Use with caution. The effects may be increased because of slower removal from the body.
  • Lung disease (e.g., bronchitis, emphysema)—Use with caution. May cause difficulty with breathing in patients with this condition.

Proper Use

In addition to the use of this medicine, treatment for your high blood pressure may include weight control and changes in the types of foods you eat, especially foods high in sodium (salt). Your doctor will tell you which of these are most important for you. You should check with your doctor before changing your diet.

Many patients who have high blood pressure will not notice any signs of the problem. In fact, many may feel normal. It is very important that you take your medicine exactly as directed and that you keep your appointments with your doctor even if you feel well.

Remember that this medicine will not cure your high blood pressure, but it does help control it. You must continue to take it as directed if you expect to lower your blood pressure and keep it down. You may have to take high blood pressure medicine for the rest of your life. If high blood pressure is not treated, it can cause serious problems such as heart failure, blood vessel disease, stroke, or kidney disease.

You may take this medicine with or without food.

Dosing

The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.

The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.

  • For oral dosage form (tablets):
    • For high blood pressure:
      • Adults—At first, 20 milligrams (mg) once a day. Your doctor may increase your dose if needed.
      • Children—Use and dose must be determined by your doctor.

Missed Dose

If you miss a dose of this medicine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.

Storage

Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.

Keep out of the reach of children.

Do not keep outdated medicine or medicine no longer needed.

Ask your healthcare professional how you should dispose of any medicine you do not use.

Precautions

It is very important that your doctor check your progress at regular visits to make sure this medicine is working properly and to check for unwanted effects.

This medicine may cause heart failure in some patients. Stop using this medicine and check with your doctor right away if you are having chest pain or discomfort; dilated neck veins; extreme fatigue; irregular breathing; an irregular heartbeat; shortness of breath; swelling of the face, fingers, feet, or lower legs; weight gain; or wheezing.

Do not interrupt or stop taking this medicine without first checking with your doctor. Your doctor may want you to gradually reduce the amount you are taking before stopping it completely. Some conditions may become worse when the medicine is stopped suddenly, which can be dangerous.

This medicine may cause a serious type of allergic reaction called anaphylaxis. Anaphylaxis can be life-threatening and requires immediate medical attention. Call your doctor right away if you have a rash; itching; hoarseness; trouble breathing; trouble swallowing; or any swelling of your hands, face, or mouth while you are using this medicine.

Make sure any doctor or dentist who treats you knows that you are using this medicine. Do not stop taking this medicine before surgery without your doctor's approval.

This medicine may cause changes in your blood sugar levels. Also, this medicine may cover up signs of low blood sugar, such as a rapid pulse rate. Check with your doctor if you have these problems or if you notice a change in the results of your blood or urine sugar tests.

Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.

Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

Less common

  1. Chest pain
  2. difficult or labored breathing
  3. increased sweating
  4. pain in the limbs
  5. shortness of breath
  6. tightness in the chest
  7. wheezing

Incidence not known

  1. Abdominal or stomach tenderness
  2. abdominal or stomach pain, usually after eating a meal
  3. black, tarry stools
  4. blood in the urine
  5. bloody nose
  6. bloody stools
  7. constipation
  8. cough or hoarseness
  9. diarrhea
  10. fever with or without chills or sore throat
  11. general feeling of tiredness or weakness
  12. heavier menstrual periods
  13. lower back or side pain
  14. nausea
  15. painful or difficult urination
  16. pinpoint red spots on the skin
  17. rectal bleeding
  18. skin rash
  19. sore throat
  20. sores, ulcers, or white spots on the lips or in the mouth
  21. unusual bleeding or bruising
  22. unusual tiredness or weakness
  23. vomiting
  24. worsening of heart block

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Symptoms of overdose

  1. Blurred vision
  2. chest pain or discomfort
  3. confusion
  4. difficulty with breathing
  5. dilated neck veins
  6. dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  7. extreme fatigue
  8. irregular breathing
  9. noisy breathing
  10. slow or irregular heartbeat
  11. sweating
  12. swelling of the face, fingers, feet, or lower legs
  13. weight gain

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

  1. Headache

Less common

  1. Acid or sour stomach
  2. belching
  3. body aches or pain
  4. chills
  5. difficulty with breathing
  6. ear congestion
  7. fever
  8. heartburn
  9. indigestion
  10. lack or loss of strength
  11. loss of voice
  12. nasal congestion
  13. nausea
  14. runny nose
  15. sleeplessness
  16. sneezing
  17. sore throat
  18. stomach discomfort, upset, or pain
  19. trouble sleeping
  20. unable to sleep

Rare

  1. Decreased interest in sexual intercourse
  2. inability to have or keep an erection
  3. loss in sexual ability, desire, drive, or performance

Incidence not known

  1. Crying
  2. decreased awareness or responsiveness
  3. depersonalization
  4. dysphoria
  5. euphoria
  6. hair loss or thinning of the hair
  7. memory loss
  8. mental depression
  9. mimicry of speech or movements
  10. mutism
  11. negativism
  12. pain of the penis on erection
  13. paranoia
  14. peculiar postures or movements, mannerisms or grimacing
  15. quick to react or overreact emotionally
  16. rapidly changing moods
  17. reddened skin
  18. severe sleepiness
  19. skin rash

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.