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Phentolamine (fen-TOLE-a-meen) given by injection causes blood vessels to expand, thereby increasing blood flow. When injected into the penis (intracavernosal), it increases blood flow to the penis, which results in an erection.
This medicine should not be used as a sexual aid by men who do not have erectile dysfunction. If the medicine is not used properly, permanent damage to the penis and loss of the ability to have erections could result.
Phentolamine is available only with your doctor's prescription, in the following dosage form:
Before Using This Medicine
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 phentolamine, the following should be considered:
Allergies- Tell your doctor if you have ever had any unusual or allergic reaction to phentolamine. Also tell your health care professional if you are allergic to any other substances, such as foods, preservatives, or dyes.
Older adults- Many medicines have not been studied specifically in older people. Therefore, it may not be known whether they work exactly the same way they do in younger adults or if they cause different side effects or problems in older people. Although there is no specific information comparing the use of phentolamine for erectile dysfunction in the elderly, it is not expected to cause different side effects or problems in older people than it does in younger adults.
Other medicines- 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. Tell your health care professional if you are taking any other prescription or nonprescription (over-the-counter [OTC]) medicine.
Other medical problems- The presence of other medical problems may affect the use of phentolamine. Make sure you tell your doctor if you have any other medical problems, especially:
Proper Use of This Medicine
To give the injection:
This medicine usually begins to work in about 10 minutes. You should attempt intercourse within 2 hours after injecting the medicine.
The dose of phentolamine 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 phentolamine. If your dose is different, do not change it unless your doctor tells you to do so.
To store this medicine:
Precautions While Using This Medicine
Use the injection exactly as directed by your doctor . Do not use more of it and do not use it more often than ordered. If too much is used, the erection may become so strong that it lasts too long and does not reverse when it should. This condition is called priapism, and it can be very dangerous. If the effect is not reversed, the blood supply to the penis may be cut off and permanent damage may occur.
Contact your doctor immediately if the erection lasts for longer than 4 hours or if it becomes painful . This may be a sign of priapism and must be treated right away to prevent permanent damage.
If you notice bleeding at the site when you inject the medicine, put pressure on the spot until the bleeding stops. If it doesn't stop, check with your doctor.
It is important for you to examine your penis regularly. Check with your doctor if you find a lump where the medicine has been injected or if you notice that your penis is becoming curved. These may be signs that unwanted tissue is growing (called fibrosis), which should be seen by your doctor.
Side Effects of This Medicine
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 the following side effects occur:
Check with your doctor as soon as possible if the following side effects occur:
Other 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. However, check with your doctor if any of the following side effects continue or are bothersome:
Phentolamine injected into the penis may cause tingling at the tip of the penis. This is no cause for concern.
Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.
Once a medicine has been approved for marketing for a certain use, experience may show that it is also useful for other medical problems. Although this use is not included in product labeling, phentolamine is used in certain patients with the following medical conditions:
Last updated: Tue, 06 Jan 2009 00:20:03 GMT