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Ionamin Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
Ionamin (phentermine resin) is a stimulant used together with diet and exercise to treat obesity (overweight) in people with risk factors such as high blood pressure, high cholesterol, or diabetes. The brand name Ionamin is discontinued, but generic versions may be available. Common side effects of Ionamin (phentermine resin) include dizziness, dry mouth or unpleasant taste in the mouth, difficulty sleeping (insomnia), irritability, restlessness, hyperactivity, nausea, vomiting, diarrhea, constipation, headache, tremors, increased or decreased interest in sex, or impotence.
The dose of Ionamin is one capsule daily, before breakfast or 10-14 hours before retiring. Ionamin may interact with blood pressure medications, insulin or oral diabetes medications, guanethidine, or antidepressants. Tell your doctor all medications and supplements you use. Ionamin must not be used during pregnancy. It may harm a fetus. If you are pregnant or think you may be pregnant, tell your doctor. This drug may pass into breast milk and could have undesirable effects on a nursing infant. Breastfeeding is not recommended while using this drug. Withdrawal symptoms may occur if you suddenly stop taking this medication.
Our Ionamin (phentermine resin) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What is Patient Information in Detail?
Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.
Ionamin in Detail - Patient Information: Side Effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have a serious side effect such as:
- feeling short of breath, even with mild exertion;
- chest pain, feeling like you might pass out;
- swelling in your ankles or feet;
- pounding heartbeats or fluttering in your chest;
- confusion or irritability, unusual thoughts or behavior;
- feelings of extreme happiness or sadness; or
- dangerously high blood pressure (severe headache, blurred vision, buzzing in your ears, anxiety, chest pain, shortness of breath, uneven heartbeats, seizure).
Less serious side effects may include:
- feeling restless or hyperactive;
- headache, dizziness, tremors;
- sleep problems (insomnia);
- dry mouth or an unpleasant taste in your mouth;
- diarrhea or constipation, upset stomach; or
- increased or decreased interest in sex, impotence.
Read the entire detailed patient monograph for Ionamin (Phentermine Capsules)
What is Patient Information Overview?
A concise overview of the drug for the patient or caregiver from First DataBank.
Ionamin Overview - Patient Information: Side Effects
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor immediately if any of these unlikely but serious side effects occur: fast/irregular/pounding heartbeat, mental/mood changes (e.g., agitation, uncontrolled anger, hallucinations, nervousness), uncontrolled muscle movements, change in sexual ability/interest.
Stop taking this medication and seek immediate medical attention if any of these rare but very serious side effects occur: severe headache, slurred speech, seizure, weakness on one side of the body, vision changes (e.g., blurred vision).
This drug may infrequently cause serious (sometimes fatal) lung or heart problems (pulmonary hypertension, heart valve problems). The risk increases with longer use of this medication and use of this drug along with other appetite-suppressant drugs/herbal products. If you notice any of the following unlikely but very serious side effects, stop taking this medication and consult your doctor or pharmacist immediately: chest pain, difficulty breathing with exercise, decreased ability to exercise, fainting, swelling of the legs/ankles/feet.
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any of the following symptoms of a serious allergic reaction: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Read the entire patient information overview for Ionamin (Phentermine Capsules)
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Ionamin FDA Prescribing Information: Side Effects
Gastrointestinal: Dryness of the mouth, unpleasant taste, diarrhea, constipation, other gastrointestinal disturbances.
Read the entire FDA prescribing information for Ionamin (Phentermine Capsules)
Additional Ionamin Information
Ionamin - User Reviews
Ionamin User Reviews
Now you can gain knowledge and insight about a drug treatment with Patient Discussions.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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