The U. You should not use phentermine if you are allergic to it, or if you have:. Do not use phentermine if you have used an MAO inhibitor in the past 14 days.
A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine, and others. Weight loss during pregnancy can harm an unborn baby, even if you are overweight. Do not use phentermine if you are pregnant. Tell your doctor right away if you become pregnant during treatment. Phentermine is not approved for use by anyone younger than 16 years old. Get emergency medical help if you have signs of an allergic reaction : hives; difficult breathing; swelling of your face, lips, tongue, or throat.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. Avoid driving or hazardous activity until you know how this medicine will affect you. Your reactions could be impaired. Use Phentermine Lomaira exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended. However, some common explanations for a phentermine headache include:.
One of the main effects of this activation response is tightening and narrowing of blood vessels vasoconstriction in the digestive organs and widening of blood vessels vasodilation in the skeletal muscles, heart, lungs and brain 3. The chemical changes associated with this response also increase heart rate and blood pressure to provide the muscles with the oxygen and nutrients they need 4.
When cerebral arteries blood vessels around the brain dilate, blood flow increases to the brain. While brain tissue itself does not feel pain, the expansion of the blood vessels triggers surrounding nerves to send pain signals to your head and face 5. These signals may be responsible for your headache.
This medication increases water needs and staying hydrated is critical to weight loss 6. Without enough water, tissues and blood vessels contract and electrolytes levels can get thrown out of balance , which triggers head pain. So, the trick to treating and preventing this type of phentermine headache is maintaining adequate fluid consumption each day.
Following an overly-restrictive diet often causes headaches because dramatic changes in blood sugar or diet can alter hormone levels. Hypoglycemia low blood sugar , for example, causes headaches, confusion, nausea and other symptoms 7. Long periods of fasting, such as those promoted by diets like intermittent fasting, may trigger or exacerbate a hypoglycemic headache.
Finally, skimping on shut-eye can cause headaches, or even migraines. Insomnia is a common phentermine side effect, so sleep problems are a widespread trigger of phentermine headaches. Interestingly: too much sleep, too little sleep or poor-quality sleep can call trigger or exacerbate headaches 8. Sleep problems contribute to head pain because the brain uses sleep to recharge and refuel.
Like most side effects, phentermine headaches often decrease as your body adjusts to the medication. Conclusion: Phentermine is a sympathomimetic agent found commonly in weight-loss products. Sympathomimetics have been linked to the development of hypertension, which can lead to cardiovascular and neurologic hemorrhages.
We believe that the SAH in this patient was likely secondary to drug-induced hypertension or vasculopathy from the phentermine. These side effects can include dizziness, feeling nervous and excitable, headache, hard stools or diarrhea, dry mouth, and not being able to sleep. They can also include decreased interest in sex or change in ability to have sex.
If you drink alcohol, talk to your doctor. You may need to be more closely monitored for side effects. Phentermine may make your PPH worse. These include stroke, arrhythmia irregular heartbeat , heart failure, coronary artery disease, valve disease, and uncontrolled high blood pressure. Phentermine may cause a serious increase in your blood pressure. This may make your heart work harder.
The extra stress on your heart may make your heart disease worse. For people with history of hyperthyroidism: Tell your doctor if you have hyperthyroidism an overactive thyroid. Phentermine may increase your thyroid activity.
This may raise your thyroid levels even further. For people with glaucoma: This drug may increase your eye pressure even more. This may cause permanent damage to your vision. Tell your doctor if you have glaucoma. Your doctor may lower the dosage of your diabetes drugs. For people with a history of drug misuse: This drug may be habit-forming. Tell your doctor if you have a history of drug or alcohol misuse. For people with agitation: This drug may cause restlessness and anxiety and may make your agitation worse.
For pregnant women: Phentermine is a category X pregnancy drug. That means two things:. Stop taking phentermine and call your doctor right away if you become pregnant while taking this drug. For women who are breastfeeding: Phentermine may pass into breast milk and may cause side effects in a child who is breastfed.
Talk to your doctor if you breastfeed your child. You may need to decide whether to stop breastfeeding or stop taking this medication. For seniors: The kidneys of older adults may not work as well as they used to. This can cause your body to process drugs more slowly.
As a result, a higher amount of a drug stays in your body for a longer time. This raises your risk of side effects. All possible dosages and drug forms may not be included here. Your dosage, drug form, and how often you take the drug will depend on:. The kidneys of older adults may not work as well as they used to.
Your doctor may start you on a lowered dosage or a different dosing schedule. This can help keep levels of this drug from building up too much in your body. However, because drugs affect each person differently, we cannot guarantee that this list includes all possible dosages.
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