Get emergency medical help if you have any of these signs of an allergic reaction to phentermine: 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 phentermine 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.
- Phentermine Information for Consumers
- Phentermine Information for Healthcare Professionals (includes dosage details)
- Side Effects of Phentermine (detailed)
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