This may increase the levels of venlafaxine in your body. This can cause more side effects. Your doctor may start you on a low dosage and monitor you closely if they increase your dosage.
For people with hyperthyroidism: Hyperthyroidism can increase your heart rate. Venlafaxine can also increase your heart rate. If you have hyperthyroidism and take venlafaxine, your heart rate may increase to a dangerous level. You are especially at risk if you take venlafaxine doses greater than mg per day. For people with a history of seizures: Venlafaxine raises your risk of seizures. If you have a seizure, stop taking venlafaxine and call your doctor right away.
For people with increased eye pressure glaucoma : Venlafaxine can widen your pupils and block the flow of fluid in your eye. These effects can increase the pressure in your eyes. People with a history of increased eye pressure or glaucoma should have their eye pressure checked regularly while taking venlafaxine. Do not take venlafaxine if you have uncontrolled angle-closure glaucoma.
For pregnant women: Venlafaxine is a category C pregnancy drug. That means two things:. This drug should only be used if the potential benefit justifies the potential risk to the fetus. Call your doctor right away if you become pregnant while taking this drug. For women who are breastfeeding: Venlafaxine may pass into breast milk and cause side effects in a child who is breastfed.
Talk to your doctor about breastfeeding 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, more of a drug stays in your body for a longer time. This raises your risk of side effects. Older adults may be at higher risk than younger people for low sodium levels in their blood when taking venlafaxine. For children: This drug should not be used in people younger than 18 years of age. 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:.
People with liver problems: People with mild to moderate liver problems should take about half of the typical dose. People with severe liver disease or cirrhosis may need an even lower dosage. Your doctor can tell you more. People who are on dialysis should take half of the typical dosage. However, because drugs affect each person differently, we cannot guarantee that this list includes all possible dosages. Always to speak with your doctor or pharmacist about dosages that are right for you.
Venlafaxine oral tablet is used for long-term treatment. Do not stop venlafaxine without talking to your doctor. Stopping venlafaxine too quickly can cause serious symptoms such as:. If this happens, your doctor may have you start taking venlafaxine again and decrease your dosage slowly. For this drug to work well, a certain amount needs to be in your body at all times. If you take too much: You could have dangerous levels of the drug in your body.
This can lead to death. Symptoms of an overdose of this drug can include:. But if your symptoms are severe, call or go to the nearest emergency room right away. What to do if you miss a dose: Take your dose as soon as you remember. If you remember just a few hours before your next scheduled dose, take only one dose.
Never try to catch up by taking two doses at once. This could result in dangerous side effects. How to tell if the drug is working: The symptoms of your depression or anxiety should be less severe or happen less often. A prescription for this medication is refillable. You should not need a new prescription for this medication to be refilled. Your doctor will write the number of refills authorized on your prescription.
Not every pharmacy stocks this drug. When filling your prescription, be sure to call ahead to make sure your pharmacy carries it. Many insurance companies require a prior authorization for this drug.
This means your doctor may need to get approval from your insurance company before your insurance company will pay for the prescription. There are other drugs available to treat your condition. Some may be better suited for you than others. Talk to your doctor about other drug options that may work for you.
Disclaimer: Healthline has made every effort to make certain that all information is factually correct, comprehensive, and up-to-date. However, this article should not be used as a substitute for the knowledge and expertise of a licensed healthcare professional.
You should always consult your doctor or other healthcare professional before taking any medication. The drug information contained herein is subject to change and is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. The absence of warnings or other information for a given drug does not indicate that the drug or drug combination is safe, effective, or appropriate for all patients or all specific uses.
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Before taking venlafaxine, patients should discuss their medical history with their doctor to determine whether the drug is appropriate. Patients with major depressive disorder may experience a worsening of depression, agitation and other symptoms, including thoughts of suicide, especially at the beginning of the treatment. Those caring for these patients are urged to monitor carefully for these signs and to contact a physician at once if they occur. A major depressive episode can sometimes be the first manifestation of bipolar disorder , so patients should be screened for bipolar disorder before being prescribed venlafaxine.
Seizure disorders : Venlafaxine should not be taken by patients who experience seizures. Interactions have led to serious adverse effects. Allergies : Anyone who is allergic to its ingredients should not take it.
These include venlafaxine hydrochloride, gelatin, titanium dioxide, hypromellose, iron oxide, ethylcellulose, and cellulose. High blood pressure : Venlafaxine has been linked to raised blood pressure , or hypertension , in some patients, so regular monitoring of blood pressure is recommended. Glaucoma : Anyone with a history of glaucoma should let their doctor know about this first. Pregnancy : One study, published in the Canadian Medical Association Journal CMAJ , has suggested that pregnant women who take venlafaxine may be at a higher risk of a miscarriage, so pregnant women should only take it if absolutely necessary.
Breastfeeding : As the drug can pass into breast milk, mothers taking venlafaxine should talk to their doctor before breastfeeding.
Diet : The medication should be taken with food, but there are no specific dietary restrictions, unless a doctor advises otherwise. Age : Venlafaxine is not approved for use by anyone under the age of 18 years.
In those aged 18 years and under, it has been linked to weight gain and, like other depressants, an increase in suicidal thinking. It has been found to increase the risk of suicidal thinking, especially in children, teenagers, and young adults. A missed dose should be taken as soon as the person remembers to take it, but if it is nearly time for the next dose, they should skip the missed dose.
Other effects include tremor, vertigo , headache, hallucinations, impaired concentration, fatigue , and paresthesia, which is a sensation of pricking, tingling, or creeping on the skin. If anyone takes too much venlafaxine, someone should call their local poison control center for advice on If the person collapses or stops breathing, call Like all medicines, venlafaxine should be stored in a locked cabinet, out of the reach of children.
It is important also to keep the doctor informed of any other medications, supplements, and health conditions the user might have. People who are using venlafaxine should attend all their medical appointments, because the doctor will need to monitor for blood pressure and other signs.
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