Drug InfoNet.com
Ask the Expert
Drug Information
Disease Information
Health News
Health Info
Panel Registration
Healthcare Orgs
Medical Refs
Gov't Sites
Med Schools
Special Offers

Drug Infonet provides drug and disease information for your healthcare needs. Visit our FAQ page to find answers to common health questions. Look on the Manufacturer Info page to link to pharmaceutical company pages. Click to Health Info and Health News for the latest in healthcare developments.

Drug Infonet brings this free resource to you so that you become a more informed consumer of healthcare.

Doctors' Answers to "Frequently Asked Questions" - Phen-Fen

These comments are made for the purpose of discussion and should NOT be used as recommendations for or against therapies or other treatments. An individual patient is always advised to consult their own physician.

[posted 03/14/2000]
Question: I took Phen Phen for 3 months in 97. I have Prolapsed Mitral Valve. I am having chest pain and my neck hurts in front - kind of sore. Had a complete physical last week - Blood, EKG, Pulmonary Function - said I have asthma. Given Provental. Hurting again. After stopping Phen-Phen, I had a sonogram, EKG, etc on my heart. Was told all was ok. What could this pain be? All my blood work was ok. Thyroid, CBC, Sed Rate, Cholesterol, Liver Function etc...Any ideas?

Answer: Not the phen phen unless you developed a valvular leak, and the valvular lesion was primarily the tricuspid valve. You should have an echo, but the phen-phen is not the cause of this pain.

Any Relationship Between Phen-fen & Cancer [posted 11/11/98]
Question: I took phenfen 1/97-5/97 did not lose one ounce, but noticed 7/98, 8/98 loss of exercise tolerance, tired, on leaning forwartd had to gasp to breath, PCP sent me for echo 10/97 mod. mitral regurg and mild tricuspid regurg. The SECOND ECHOCARDIO 6/98 revealed mild mitral regurg and minimal tricuspic regurg, the xray cloudy and showed hilar fullness, CT scan showed in left upper lobe of lung cancer, had lung surg 7 8 98 adenoca bronchioalveolar non small cell cancer very very small, I did excel, back to work in 15 days, still tired,On 10/97 my ANA noted to be 1:640, on 12/97 ANA 1:2560 where it has remained since. I feel very much that ANA elevation due to toxic effects I am having from phen-fen and would like to know if phenfen increases incidence of lung cancer? What are the results of info about phen-fen turning out to be?

Answer: No clear cause of either drug induced lupus or carcinoma to date. Further testing is being done by the FDA, to date valvular problems dominate the problem list.

Phentermine Capsules [posted 8/11/98]
Question: I have a concern. My doctor put me on Phentermine because I am 50 lbs. overweight and 5 feet tall. My knees hurt very bad when I walk. I have noticed that after I take Phentermine I get really hyper and it scares me. My doctor told me that the drug only comes in 30 mg, but I could even it out by splitting the capsule in half for a lesser effect?

Answer: Capsules are nearly impossible to split and get accurate dosing. Pills can be split, not capsules.

Phentermine [posted 7/30/98]
Question: Last summer I went to a physician for assistance with weight control. He prescribed 30 mg of phentermine (daily). I was able to lose 40 pounds and to make a lot of positive lifestyle changes. Now that I have no more medication, I find that my mood is consistently much less bright. I find myself becoming depressed much more often for no real reason. I told my physician that I felt I was suffering from some sort of withdrawal. He prescribed 14 more days of phentermine (every other day) to assist with weaning me off but he'll give me no more since I have no more weight to lose. Comparing how I feel now to how I felt using the medication, I've begun to wonder whether I could benefit from a MAO inhibitor. Am I right about this? I don't know whether to go back to the diet doctor, or make an appointment with a regular physician, or to call a psychiatrist.

Answer: Possibly, St. John's Wort is available over the counter and thought to be a weak MAO inhibitor. 300 mg three times a day is the usual dose to start.

Question: Can I take phentermine while taking thyroid medicine, such as 0.112 mg of levoxyl? Also, is shortness of breath a side effect of phentermine?

Answer: It shouldn't be a problem taking both together. Shortness of breath should not be a symptom per se, unless it is affecting your heart. If you are going to take this long term, I'd err on the side of safety and get a cardiac echo prior to use and while taking. The information and risk factors for pulmonary hypertension and valvular lesions are not really clear yet.

Herbal Phen-Fen
Question: I have recently purchased at a local Health Food Store the herbal Phen-fen. I am on my third week and wonder if you feel it is safe? Also, could gritting my teeth at night give me headaches or do you think the Herbal phen-fen is the culprit?

Answer: I'm not aware of the ingredients of "herbal Phen-fen." Send these along and I'll try to help. Secondly, bruxism(grinding ones teeth) is a notorious cause of headaches and jaw pain. I doubt the Phen-fen is the cause. Check with your dentist about oral retainers to minimize teeth damage and headaches.

Question: I started to take the combo of these two drugs and then the big scare came in the picture about the heart disease. So I stopped after only 5 days. Many of my friends are taking only the phentermine saying that the Pondimin is the drug causing all the heart problems. Is that true? And is it okay to take only the phentermine?,

Answer: Nobody knows if the risk is for real and if for real which drug(s) are implicated. Stay off of them unless you have an overwhelming medical reason(diabetes, hypertension etc.).

Question: I would like to know the possible side affects of Phen Fen. I would like to lose about 80 lbs. Also the risks involved.

Answer: There are expected minor risks and possible but unexpected major risks. Common minor side effects include dry mouth, constipation, occasional urinary hesitancy, and mild constipation. Potential major risks are pulmonary hypertension and valvular heart damage. The incidence of these risks is unknown, but it appears to be about 1/1000 patients. These are uncommon but potentially fatal consequences.

Question: I have some questions about the weight loss program phen-fen. In the Last year I have been on the drug twice. Since then I have been told I Have asthma because my breathing got real bad. So, I have to take two Inhalers twice a day, but sometimes I don't think that is my problem. I Went and had my lungs and heart checked out and everything and it was OK. I was on it for three months and got off of it, then 4 months later Got right back on the stuff for three months in between. That was when I Went to the doctor, and now I have trouble breathing. My chest feels like Someone is trying to push my chest out of me. Do I have a reason to be Afraid? Ever since I was on the drug I have never felt the same! I Only wanted to lose about 15 pounds.

Answer: There are reported cases of pulmonary hypertension on this drug, and potentially this could lead to your shortness of breath. You will need a complete examination including an echocardiogram to determine if there has been any damage to your heart valves or pulmonary circulation(both reported on this drug). However, short term usage appears fairly safe currently.

Question: What, if any, are the side effects, complications or problems if you become pregnant while on phen-fen? If the medication is stopped immediately, is a normal pregnancy possible?

Answer: We don't really know since there has not been research done on pregnant women(and won't be). Research in rats didn't show major problems, and there are enough women taking it that warnings would appear rapidly if any problem was showing up. I think if you stop it as soon as you realize that you are pregnant everything should be OK.

Question: Will taking Phen-Fen do me more harm than good? I am 50 years old and in good health. My only problem is that I am overweight.

Answer: Currently, there is no consensus on phen-fen. There is a potential risk of pulmonary hypertension and a recent report from Mayo about damaged heart valves on 26 patients who had used the drug for in excess of one year. My current recommendation to my patients is to not take the drug for purely cosmetic reasons. This is due to the unknown nature of the side effects and the fact that most of my patients have regained the weight after going off the drug. However, I do use it in patients with diabetes mellitus, elevated cholesterol, etc., who will medically benefit from the weight loss. I use it for short periods and try dietary counseling as well. I have had no problems with the medications to date in my own experience. However, we are all concerned and I think the unknown risks outweigh the benefits if you have no medical problems.

Question: I Have stopped taking phen-fen. Have heard it may cause cardiopulmonary problems. Has that been clinically proven?

Answer: The condition that has everyone worried is Primary Pulmonary Hypertension. This is a relatively rare condition, but it can be fatal or lead to severe disability(potentially a heart/lung transplant). Primary Pulmonary Hypertension has no known cause and results in an inability to breathe without oxygen due to increasing pressure in the pulmonary circulation of the body. The concern over fen-fen regimen as well as Redux is a study from Europe which studied patients with PPH. This study showed a relatively high association between taking these drugs and developing PPH. This is a preliminary study and does not establish a link-- merely a statistical association. The risk is still small at about 1-2 of every 4000 taking the drug. However, the potential consequences are so severe(potentially death) that the whole medical community is concerned. I still use the drug but only for those patients with diabetes, hypercholesterolemia, etc... who will definitely benefit-- for medical weight loss reasons, not cosmetic reasons. However, each patient should realize the potential risk, currently unproven, that could lead to severe disability including death.

Question: Can migraine sufferers who are overweight take Phen-Fen? What is a recommended meal plan for someone who takes this drug?

Answer: There doesn't appear to be any special problem with migraines. Patients of mine have not reported any increase in migraines in either severity or frequency. There is no special meal plan since this drug seems to decrease appetite in general. Clearly trying to limit ones calories while taking this drug will be more beneficial. There are diets that help some migraine sufferers. That is, some people will find their migraines triggered by certain diets or foods. This is particularly true of so called cluster migraines. The foods are any food high in tyramine especially chicken livers, cheese, sour cream, yogurt, pickled herring, soy sauce, beer, wine(especially red wines),bananas, avocados, broad beans(Fava etc.), chocolate, raisins etc.

Question: I'm an internist and I have many overweight patients. The best treatment right now is phentermine-fenfluramine. What country in the European community may I have my patients import it from? Do you know of a site where I could find such pharmacy?

Answer: These drugs are available by prescription in the U.S. They must be prescribed separately and do not come as a combined drug. I doubt that this will happen.

Question: I am 49 and in good health. Over the past 10 months, Iíve lost 45 lbs. I started taking Phen Phen in January due to doctorís suggestion. Iím almost at my goal. Iím afraid that when I go off the drugs, that I will gain back the weight. Is there an easy way to gradually go off Phen Phen? I see many of my friends that have gained back all of the weight.

Answer: Unfortunately, like many forms of weight loss, the weight tends to return after stopping the diet or medications. I know of no way currently to keep the weight off without changing your lifestyle; that is, exercising more and eating less. Tapering will not help much.

Question: I am considering beginning a treatment of Phen-Fen. Could you provide me with information on it?

Answer: Medicine has attempted for many years to find an agent or drug which would aid in weight loss. Unfortunately, the only drugs which had any effect were amphetamines, but they were very addictive and generally only effective for a month at best. About two years ago research was published in several reputable medical journals concerning the use of phentermine resin(Ionamin) and flenfluramine(pondimin) in combination which resulted in sustained weight loss with minimal side effects. Subsequently, a second drug - Redux(dexfenfluramine) has been added to the list . These medications appear to work through a brain chemical called serotonin although the mechanism is not exactly clear. But patient's hunger was reduced with reduction in serotonin levels. Since the publication of this research, literally millions of patients have been placed on these drugs. In general, I find them very effective with sustained weight loss while taking the pills, but like many weight loss regimens, gain of weight after cessation. Side effects generally are dry mouth, diarrhea, constipation, drowsiness, headaches and fatigue. These drugs should not be taken with other anti-depressants(particularly MAO inhibitors, SRI anti-depressants), and Imitrex(migraine medication). It should not be taken under the age of 18, while breast feeding, or if glaucoma is present or while taking other weight loss drugs. Since the initial publication, there have been reports of an increased incidence of pulmonary hypertension with these drugs. This is an uncommon, but potentially fatal side effect. This has caused many physicianto < avoid these drugs unless there is a distinct medical benefit from losing weight - like diabetes, hypertension, etc. The companies only recommend the drug if your body mass index is high. This is calculated by dividing your height in inches into your weight. Levels above 2.8 or 2.9 qualify for the drug. Currently, there is insufficient data to know the true risk of pulmonary hypertension. However, these drugs should not be used casually unless there is a clear medical risk until further research is performed on the true incidence of pulmonary hypertension.
Back to Drug InfoNet Home Page.

Back to Medication/Pharmaceutical main page.

FAQ Drug Info Disease Info Manufacturer Info Health Care News Health Info Become Panelist Health Care Orgs Medical References Government Sites Hospital Sites Medical Schools
Contact | Site Map | Search | Disclaimer | Mission Statement

© 1996-2005 DRUG INFONET, Inc. All rights reserved.