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Doctor insights on: Does Effexor Cause Constipation

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Increased effexor from 75mg to 150 mg 3 days ago and now experiencing constipation and gas. Is this common? I toleranced the first 75mg well.

Increased effexor from 75mg to 150 mg 3 days ago and now experiencing constipation and gas. Is this common? I toleranced the first 75mg well.

Side effects from: Medications such as Effexor (venlafaxine), including constipation and gas, may occur early in treatment and after dose changes. They should subside as the body adjusts. If they continue and are intolerable then it is best to discuss them with your prescriber. Supportive measures can help. Best regards for relief. ...Read more

Dr. Krishna Kumar
547 Doctors shared insights

Venlafaxine (Definition)

It belong to classification of snri antidepressant also help anxiety start slow go slow its approved for depression and anxiety disorder there are some common side effects important never stop suddenly always taper slowly if you ever ...Read more


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I've been on 75 mg of Effexor (venlafaxine) for gad for 3 wks. Some side-effects (constipation, lowered appetite), but no reduction in anxiety. Give it more time?

I've been on 75 mg of Effexor (venlafaxine) for gad for 3 wks. Some side-effects (constipation, lowered appetite), but no reduction in anxiety. Give it more time?

They say 6-8 wks: The time to maximal symptom reduction varies greatly. Early relief may be mostly placebo effect, but the great bulk of users agree that full function can be as long as 6-8 weeks. So, if you can tolerate the side effects, give it more time. But do talk with your doctor so both of you know what's happening and what to expect. Consider a talk therapist too since many mds have so little time. Best! ...Read more

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Besides constipation, only side-effect of Effexor (venlafaxine) (150mg for GAD) is vivid, anxiety-provoking dreams. Gone from 1 biweekly to daily! Lower dose?

Besides constipation, only side-effect of Effexor (venlafaxine) (150mg for GAD) is vivid, anxiety-provoking dreams. Gone from 1 biweekly to daily! Lower dose?

Anxiety, Aging: I understand your Anxiety.
At age 65, many people go through Anxiety due to aging, medical problems, loss of loved ones, loneliness, neglect from children, retirement and finances.
Effexor (venlafaxine) can cause constipation and abnormal dreams.
Sprycel and Flomax can cause insomnia.
Lack of effectiveness with Effexor (venlafaxine) 150mg/day indicates need to see a Psychiatrist for Therapy, other medications, Relaxation. ...Read more

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Only side-effect of Effexor (venlafaxine) (150mg, 9 months): constipation. In tapering off (over 6 wk.) and 6 wks since: loose bowels/ diarrhea. Withdrawal effect?

Only side-effect of Effexor (venlafaxine) (150mg, 9 months): constipation. In tapering off (over 6 wk.) and 6 wks since: loose bowels/ diarrhea. Withdrawal effect?

Effexor (venlafaxine): Withdrawal symptoms may include diarrhea, but that does not necessarily mean that this is what is causing your loose stools. If it persists you may need to be examined futher. Good luck. ...Read more

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Is it possible to be weaned off the Effexor and get my body back to normal? I have been taking Effexor for years. A doctor recently increased my dosage to 300mg from 75mg. I have major digestive issues (constipation), I can't loose weight no matter what I

Is it possible to be weaned off the Effexor and get my body back to normal? I have been taking Effexor for years. A doctor recently increased my dosage to 300mg from 75mg. I have major digestive issues (constipation), I can't loose weight no matter what I

Serotonin: Serotonin discontinuation symptoms, associated with abrupt discontinuation of Effexor (venlafaxine), could be related to it`s short half life. In most cases, this may be minimized by slowly tapering the dosage. Another strategy would be using a low dosage of a long acting ssri like fluoxetine. The physical symptoms include problems with balance, gastrointestinal and flu-like symptoms, and sensory and sleep disturbances. Psychological symptoms include anxiety and/or agitation, crying spells, irritability and aggressiveness. ...Read more

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I take the generic for Effexor (venlafaxine) XR experience lots of side effects, dry mouth, sweating, muscle weakness, constipation. How can I prevent them?

I take the generic for Effexor (venlafaxine) XR experience lots of side effects, dry mouth, sweating, muscle weakness, constipation. How can I prevent them?

Side effects: I would discuss this with your dr as soon as possible and try to determine an alternative to the medication or a treatment for the symptoms that is compatible with the medication. ...Read more

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Ever since I started taking the generic for Effexor (venlafaxine) xr, I've been getting constipated all the time. I haven't changed my diet either. Help!

Ever since I started taking the generic for Effexor (venlafaxine) xr, I've been getting constipated all the time. I haven't changed my diet either. Help!

Talk to doctor: In my practice, most antidepressants, including Effexor (venlafaxine) xr, don't usually cause constipation. You need to carefully discuss this with your treating physician. There may be other general medical illnesses going on, medication interactions, and so on. Treatments for constipation are very effective once the causes are determined. Talk to your doctor. ...Read more

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For how long does Effexor (venlafaxine) cause insomnia?

For how long does Effexor (venlafaxine) cause insomnia?

Short term: There are at least three effects that venlafaxine (effexor) has on sleep - it has a short term effect increasing agitation and insomnia that lasts usually only a few days, it has a long term effect improving sleep by treating depression (which has a big negative effect on sleep), and it has a small long term effect reducing rem or dream sleep. For most people #2 is the most important. ...Read more

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Can Effexor (venlafaxine) XR cause trouble maintaining an erection?

Can Effexor (venlafaxine) XR cause trouble maintaining an erection?

Unfortunately yes: As in the range of 6% of men while have some element of erection issue and up to 20% of men can have an abnormality in ejaculation (as in delayed ejaculation or inability to ejaculate at all). ...Read more

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Could long term use of Effexor (venlafaxine) cause severe gastrointestinal problems?

Could long term use of Effexor (venlafaxine) cause severe gastrointestinal problems?

To date,: There are no long term effects of effexor (venlafaxine). It can cause GI effects- these are not severe symptoms, usually go away, and are limited to diarrhea or conversely in some patients, constipation; nausea, and rarely vomiting. Again it's usually early on.

If you're suffering from severe gastrointestinal problems, you need to see your Primary care provider to have this checked.
Good luck! ...Read more

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Please tell me can Effexor (venlafaxine) cause diabetes?

Unlikely: Anti-psychotics more likely to do so- mainly as they increase appetite, then weight

anti-depressants as effexor (venlafaxine) much less likely to do that ...Read more

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Is it possible for long term use of Effexor (venlafaxine) to cause severe GI problems?

Is it possible for long term use of Effexor (venlafaxine) to cause severe GI problems?

Reversible: Alot of the psychiatric medications can cause GI side effects. Usually constipation is a problem. This is because there is alot of serotonergic innerevation in the GI system, maybe even more than the brain. But, the bowels usually adapt, and if not they normalize when the med is discontinued. ...Read more

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Taking Effexor (venlafaxine) XR cause me to test positive on a drug test? I have been on Effexor (venlafaxine) XR for 3 years.

No: Drug tests are usually looking for specific drugs of abuse. They don't check for any and all drugs you are taking. The only way Effexor (venlafaxine) will show up is if they specifically look for effexor, (venlafaxine) and there is no good reason for them to do that. ...Read more

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I have really bad night sweats I wake up soaked I take Effexor (venlafaxine) is this the cause?

I have really bad night sweats I wake up soaked I take Effexor (venlafaxine) is this the cause?

Sweating/diaphoresis: May affect up to 22% of patients who take antidepressants. Options include stopping, decreasing, or changing antidepressants. If your medication is effective then prescriber may consider adding benztropine 0.5-1 mg a day or aripiprazole (augments antidepressant and may reduce sweating). Combining these meds with venlafaxine may increase dizziness, drowsiness. Best regards for relief. ...Read more

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Does Effexor (venlafaxine) cause severe cause severe night sweats? Used to wake up soaked and dripping with sweat.

Does Effexor (venlafaxine) cause severe cause severe night sweats? Used to wake up soaked and dripping with sweat.

Could be: Unfortunately not uncommon for effexor (venlafaxine) and other norepinephrine increasing antidepressants (eg cymbalta, less so Wellbutrin) to increase anxiety despite good compliance. Which means increased heart rate, shakes, sweats, headaches and other fight or flight symptoms. A trial of a regular ssri (prozac, lexapro, zoloft, or celexa) can be a much better option. Please ask your doc about such options. ...Read more

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On 112.5mg Effexor (venlafaxine) for 6mths. Mood dropped unexp. So upped dose to 150mg. 1mth later mood worse so now on 30mg mirtazapine. What caused mood drop?

On 112.5mg Effexor (venlafaxine) for 6mths. Mood dropped unexp. So upped dose to 150mg. 1mth later mood worse so now on 30mg mirtazapine. What caused mood drop?

Could be many causes: There can be a number of triggers to low mood, including: medical illness, stress, loss, relapse of depression, seasonal changes and even just normal variation. It would be best to talk to your doctor about the possible explanations to see if you need any further medical work-up or if adding other treatment components could be helpful (e.g. psychotherapy). ...Read more

Dr. Alan Ali Dr. Ali
3 doctors agreed:
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I am worried that I have caused myself damage from overdosing several times on effexor (venlafaxine)?

Dr. Alan Ali Dr. Ali
3 doctors agreed:
I am worried that I have caused myself damage from overdosing several times on effexor (venlafaxine)?

Effexor (venlafaxine) overdose: I am more concerned with your repeated suicide attempts than with effects of medication. Discuss a plan with your doctor regarding future therapy for your depression to help u explore alternatives to cope with despair and thoughts of self harm. ...Read more

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Take 75mg effexor (venlafaxine). If it has plateaued and stopped working, what symptoms could that cause?

Same symptoms: Usually, when pt experiences what appears to be a "plateau" in response to antidepressants, it could be that the medication needs adjustment. This is presuming there have been no other changes that have occurred, such as changes in other medications, new medical conditions, or increased psychosocial stressors. Inadequate medication adherence can also present similarly. Discuss with doctor. Best. ...Read more

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Can Effexor (venlafaxine) cause breathing problems?

Dyspnea or not?: There have been patients that develop a catch in their breath while on medications. In addition a more central problem can occur where one seems to almost forget to breathe. Ssri's and snri's (like effexor) seem to not infrequently cause this. Decreasing the dose typically does not eliminate it. It usually does not occur with all the other agents in these classes - you will find one that does not. ...Read more

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Does Effexor (venlafaxine) cause weakness or unsteady walking?

Probably not: This is not one of the more common side effects of this medication. However, with the uniqueness of each human, it is possible. If you are taking this medication and are having these symptoms, consult with your prescribing physician. ...Read more

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Can taking venlafaxine (Effexor) cause a late period? If so why?

Can taking venlafaxine (Effexor) cause a late period? If so why?

Typically not: Also depends on how your cycles were prior to Venlafaxine.
Occasional late period is common for a lot of women, factors such as travel, stress, climate change, weight changes can play a role also. If pregancy is a possibility, do a pregnancy test
Best Wishes ...Read more

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Can missing a dose of Effexor (venlafaxine) or cause lucid dreaming or out of body experiences

Can missing a dose of Effexor (venlafaxine) or cause lucid dreaming or out of body experiences

Dreams and Effexor (venlafaxine): Effexor (venlafaxine) (and all antidepressants) suppress rem sleep. We dream during rem sleep. So missing a shorter acting antidepressant (including effexor) can cause intense and vivid dreams. ...Read more

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Started effexor 75mg a few weeks ago for GAD. It is possible to cause weight gain this soon?

Started effexor 75mg a few weeks ago for GAD. It is possible to cause weight gain this soon?

Yes it can: Yes you can gain weight in few weeks with Effexor.The weight gain is partly by eating more as you feel better and partly by change in metabolism. Proper diet and exercise may help in slowing the weight gain ...Read more

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I've been having loose green stool for the past four weeks. Could this be caused by Effexor (venlafaxine) XR? I started taking it around a month ago.

I've been having loose green stool for the past four weeks. Could this be caused by Effexor (venlafaxine) XR? I started taking it around a month ago.

Effexor (venlafaxine): Effexor (venlafaxine) XR is commonly known to cause diarrhea. If temporally the onset of the diarrhea occurred after the start of the medication, then you may have to either change the medication or the dosage that you're currently taking. Do not make any changes in your medication yourself. You should report your potential side effect to your doctor for advice. Good luck. ...Read more

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My period is 4 weeks late I take Effexor (venlafaxine) XR but I have had some days I couldn't take it. Is there a way this was caused by not taking the meds?

My period is 4 weeks late I take Effexor (venlafaxine) XR but I have had some days I couldn't take it. Is there a way this was caused by not taking the meds?

Pregnant?: First find out if you could be pregnant. Make sure you are getting enough Folic Acid (at least 400 mg) and talk with your doctor about pregnancy risk with antidepressant medication.
Best of luck. ...Read more

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I'm taking effexor (venlafaxine) 150mg and Lamictal 200mg. I'm worried about my low energy. Can these drugs cause hepatotoxicity and which are the symptoms?

Talk to your doctor: This is a good combination of medication. These meds are usually well-tolerated. Talk to your doctor about the risks, benefits and side effects of your treatment. If needed, your doctor can order tests to monitor your liver. We look for a yellow coloration to the white part of the eye or yellowing of the skin (jaundice) which suggests liver injury or disease. Talk to your doctor. Best wishes! ...Read more

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All of a sudden I'm reading that anxiety may be caused by EXCESS serotonin! (I'm taking 112.5 Effexor (venlafaxine) for GAD) Is there any validity to these findings

All of a sudden I'm reading that anxiety may be caused by EXCESS serotonin! (I'm taking 112.5 Effexor (venlafaxine) for GAD) Is there any validity to these findings

NOT Simple: Serotonin (5HT) is 1 of many neurotransmitters (NTs) in the brain. The effects of too much/ too little NT aren't evident right away. The brain responds to drugs & NTs in complex ways. Low 5HT levels in the hippocampus over time cause depression. But raising 5HT levels right away doesn't reverse depression. You need time for the neurons to make new connections. 5HT in bloodstream causes anxiety. ...Read more

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Currently taking 200mg Zoloft. Effexor (venlafaxine) XR started 07/01/14. Since Effexor (venlafaxine) Iam losing weight. Went from 297 to 280. Is this a cause for concern?

Currently taking 200mg Zoloft. Effexor (venlafaxine) XR started 07/01/14. Since Effexor (venlafaxine) Iam losing weight. Went from 297 to 280. Is this a cause for concern?

No: losing weight is possible on these medications but you need to check with your provider to see if you should be on two drugs in the same family which could cause some problems like serontonin syndrome Please check with provider but I do see weight loss with some antidepressants (sometimes they gain weight) ...Read more

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I am on 300 mgs of Effexor (venlafaxine) I have lost 80 pounds my doc is lowering to 225. I told him I had no energy he thought the 300 mgs of Effexor (venlafaxine) might be the cause do you agree. Are there articles to support.

I am on 300 mgs of Effexor (venlafaxine) I have lost 80 pounds my doc is lowering to 225. I told him I had no energy he thought the 300 mgs of Effexor (venlafaxine) might be the cause do you agree. Are there articles to support.

Possible: The maximum recommended dose is 225 mg a day and weight loss has been reported so lowering the dose to the maximum recommended dose was an appropriate move by your doctor. ...Read more

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Can wellbutrin and effexor (venlafaxine) cause seizures?

Can wellbutrin and effexor (venlafaxine) cause seizures?

Wellbutrin, (bupropion) possible: Wellbutrin (bupropion) can cause seizures over a certain dosage. Your doctor is aware of this, so follow his/ her instructions and do not take more medication than prescribed. ...Read more

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Does Effexor (venlafaxine) XR cause weight loss or weight gain?

Yes: All of the ssri cause weigh gain...Sorry but it is true. The drug companies say no but the expérience says yes! ...Read more

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Can a pregnant woman's use of Effexor (venlafaxine) cause autism in the baby?

Can a pregnant woman's use of Effexor (venlafaxine) cause autism in the baby?

No evidence found: No peer-reviewed scientific studies implicate venlafaxine as a teratogen or an epigenetic factor in autism. Venlafaxine, an snri, & most ssri antidepressants. Are class c because their use during the 3rd trimester may cause transient withdrawal-type symptoms in a neonate vs. A 67% recurrence of maternal depression if withdrawn abruptly. Lawyers can and do attack drug companies without evidence. ...Read more

Effexor (Definition)

Venlafaxine is a non-tricyclic which is a kind of serotonin-norepinephrine reuptake inhibiting drug (atypical anti-psychotic ...Read more


Dr. Eric Kaplan
2,510 Doctors shared insights

Constipation (Definition)

Constipation is difficulty passing ...Read more