Serotonin Reuptake Inhibitor and Bleeding Risk, Part 2: Gastrointestinal (GI) Bleeding, Malignancy, Pregnancy, and Surgical Considerations

Psychiatric TimesVol 40, Issue 10

In this CME article, review literature on SRI-related bleeding complications in patients with GI bleeding, malignancy, perioperative settings, pregnancy, and hormonal therapy.




Premiere Date: October 20, 2023

Expiration Date: April 20, 2025

This activity offers CE credits for:

1. Physicians (CME)

2. Other

All other clinicians either will receive a CME Attendance Certificate or may choose any of the types of CE credit being offered.


The goal of this activity is to describe current understanding of bleeding risk associated with use of serotonin reuptake inhibitors (SRIs) and to review research-informed literature on related bleeding complications in patients with gastrointestinal (GI) bleeding risk, malignancy, in perioperative settings, pregnancy, and in context of hormonal therapies.


After engaging with the content of this CME activity, you should be better prepared to:

- Review literature on SRI-related bleeding complications in patients with GI bleeding, malignancy, perioperative settings, pregnancy, and hormonal therapy.

- Describe potential interventions to mitigate the risk of SRI-related bleeding complications.


This accredited continuing education (CE) activity is intended for psychiatrists, psychologists, primary care physicians, physician assistants, nurse practitioners, and other health care professionals who seek to improve their care for patients with mental health disorders.


This activity has been planned and implemented in accordance with the accreditation requirements and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint providership of Physicians’ Education Resource,® LLC, and Psychiatric Times.® Physicians’ Education Resource, LLC, is accredited by the ACCME to provide continuing medical education for physicians.

Physicians’ Education Resource, LLC, designates this enduring material for a maximum of 1.5 AMA PRA Category 1 Credits.™ Physicians should claim only the credit commensurate with the extent of their participation in the activity.

This activity is funded entirely by Physicians’ Education Resource, LLC. No commercial support was received.


This accredited CE activity may or may not discuss investigational, unapproved, or off-label use of drugs. Participants are advised to consult prescribing information for any products discussed. The information provided in this accredited CE activity is for continuing medical education purposes only and is not meant to substitute for the independent clinical judgment of a physician relative to diagnostic or treatment options for a specific patient’s medical condition. The opinions expressed in the content are solely those of the individual faculty members and do not reflect those of Physicians’ Education Resource, LLC.


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For content-related questions, email us at; for questions concerning the accreditation of this CME activity or how to claim credit, please contact and include “Serotonin Reuptake Inhibitor and Bleeding Risk: A Practical Review for the Consultation Psychiatrist, Part 2 of 2: Gastrointestinal (GI) Bleeding, Malignancy, Pregnancy, and Surgical Considerations” in the subject line.


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Serotonin reuptake inhibitors (SRIs), including selective SRIs (SSRIs) and other psychotropic medications, are used to treat a variety of psychiatric conditions, including many mood and anxiety disorders. They are among the most frequently prescribed medications in the United States. SSRIs are the most prescribed type of SRIs and were initially heralded as a safer, easier alternative to earlier psychiatric medications used for the same indications. A growing body of literature has elucidated potential adverse effects that appear germane to all medications that inhibit serotonin reuptake.

One example of this is SRI-related increases in bleeding risk. Even though the presence of this risk is becoming more widely accepted and known by clinicians, the literature—which is simultaneously complex and limited—is not always easily translated into clinical practice. In this 2-part series, we aim to address this problem by offering a summary of the current state of the literature on the risk of SRI-related bleeding and offer advice for clinical practice.

In part 1, we reviewed physiological mechanisms by which SRIs can increase bleeding risk,1 including major findings on the risk of SRI-related bleeding across a variety of cardiovascular conditions and blood-thinning agents. Our recommendation was that clinicians should take an individualized approach to managing SRIs in these circumstances rather than using “rules of thumb.”

Here in part 2, we will describe bleeding risk with SRIs in gastrointestinal (GI) bleeds, surgical/perioperative conditions, malignancy, and pregnancy, and in patients treated with hormonal therapies. We will offer recommendations that may have broader applicability in patients who are taking SRIs, such as using gastroprotective agents when an SRI is continued in a patient who is at an elevated risk for bleeds, and factoring in medication interactions when deciding how to manage an SRI in medically complex patients.

As noted in part 1, we use the general term SRI (serotonin reuptake inhibitor) for any medication with this property, which can include SSRIs, SNRIs, tricyclic antidepressants, and more. When cited studies examined 1 medication or class of medications, we have attempted to specify this in the text.

GI Bleeding

The bidirectional signaling between the gut and brain has become a focus of research over recent decades, with an expanding body of literature demonstrating a link between mental and GI health.2-5 Despite the additive risk of GI bleeding from the combination of SRIs with nonsteroidal anti-inflammatories (NSAIDs) or warfarin,1 the potential for SRIs to further increase the risk of GI bleeding when prescribed with other ulcer-causing medications has been underexplored in the literature.6 The risk factors for GI bleeding should be evaluated in patients who present with depression prior to the prescription of SRIs (Table 1).

TABLE 1. Risk Factors for GI Bleed That Should Be Explored in Patients Who Present With Depression Prior to Considering the Prescription of SRIs

Table 1. Risk Factors for GI Bleed That Should Be Explored in Patients Who Present With Depression Prior to Considering the Prescription of SRIs

Peptic ulcer disease (PUD) is a common cause of GI bleeding.7 Perforated peptic ulcers are associated with high mortality, rising to nearly 50% in the setting of advanced age.8 In 1 large Taiwanese study, the incidence of PUD in patients with depression was twice as high as those without (33.2 vs 16.8 per 1000 person-years), with an age adjusted HR of 1.97 (95% CI, 1.89-2.06).9 Another large longitudinal cohort study showed a significant bidirectional relationship between depression and PUD compared to controls (P < .001 for PUD in patients with depression, and P < .001 for depression in patients with PUD) after adjusting for lifestyle and environmental factors.10,11 Robust data from a recent population-based study of 83.9 million person-years further support the association between PUD and depression.11 In a study of 337,536 UK Biobank participants, the authors concluded there was a causal link between depression and various GI illnesses, including GI hemorrhage (OR 1.26; 95% CI, 1.11-1.43).12,13

The potential for GI bleeding in patients with comorbid depression and heavy alcohol use should be considered by prescribers. Heavy alcohol use, especially distilled spirits, contributes to PUD and that effect is amplified with concomitant NSAID use.14 Alcohol can specifically contribute to development of cirrhosis, in turn causing thrombocytopenia and variceal disease, which are both major risk factors for GI bleeding. Individuals with alcohol dependence are 3.7 times more likely to have major depression and 2.8 times more likely to have dysthymia—therefore, they may present requesting antidepressant treatment.15

The relationship between alcohol and depression has been underappreciated as a potential confounder in studies seeking to calculate the risk of GI bleeding in the setting of SRI use. For example, Opatrny and colleagues found that the addition of alcohol abuse as a novel covariate reduced the size of the associations observed between antidepressant use and GI bleeding.16 More research is needed to further characterize these interactions.

Clinicians should encourage patients to view reduction of alcohol use as an important step in treating anxiety and depression. The evidence for the use of SRIs in alcohol-induced psychiatric conditions is sparse and continued alcohol use likely blunts their efficacy. In rare instances, SSRIs may lead to increased alcohol consumption as an adverse effect.17

Gastroprotection from acid-suppressing medications may reduce the risk of GI bleed in patients taking SRIs.18,19 Gastroprotection should be considered for individuals for whom SRI prescription is justified despite the presence of risk factors for GI bleeding, particularly those using coprescribed NSAIDs or warfarin, and is supported by an emerging body of literature.6,18-21 As many as 80% of patients who develop upper GI bleeding due to PUD are on 1 or more medications known to increase the risk of PUD or GI bleeding, and the utilization of gastroprotection is low at 8.5%.22

Clinicians should check for drug-drug interactions when adding gastroprotective agents, as several proton pump inhibitors (PPIs) and H2 blockers can alter serum levels of SRIs through effects on the cytochrome system in the liver. A 50% dose reduction of escitalopram should be considered when coprescribed with omeprazole or esomeprazole.23 Electrocardiographic monitoring of the QTc interval should be performed in patients coprescribed a QTc-prolonging antidepressant and cimetidine.24


Depressive symptoms are the most common psychiatric sequelae of oncologic illness and antidepressants are the most commonly prescribed psychotropic medication in this population.25,26 Malignancy is generally regarded as a prothrombotic state, largely due to aberrant proteins associated with malignant cells interacting with blood vessels and inducing the coagulation cascade. However, malignancy is often accompanied by numerous factors associated with an increased risk of bleeding, including disruption of the integrity of healthy tissue by the tumor, platelet, or bone marrow dysfunction secondary to chemotherapy or other therapeutics, or anticoagulation therapy prescribed for cancer-related thromboembolic disease. Severe thrombocytopenia is a common adverse effect of cancer treatments that is associated with bleeding events.

Despite this, the literature on antidepressants and bleeding in oncologic patients is meager. One of the few studies on bleeding risk and SRI use in patients with malignancy found that patients on SSRIs who underwent surgery for breast cancer had increased rates of reoperation due to postoperative bleeding, with an adjusted relative risk of 2.3 compared to non-SSRI users.27 Given that the focus of this study was on surgical procedures and outcomes, it is difficult to ascertain what conclusions can be drawn on the contribution of the malignancy itself to the study’s findings. This illustrates the paucity of literature on SRI-associated bleeding in risk in patients with malignancy.

The principles outlined in prior sections, such as being cautious when coprescribing antidepressants and warfarin, NSAIDs, or antiplatelet agents, should be used to guide clinicians when caring for oncologic patients. Given the high burden of psychiatric illness in patients with cancer, the authors recommend prescribing SRIs for patients with malignancy for whom these medications would otherwise be indicated unless the patient has additional risk factors such as severe thrombocytopenia or active bleeding.

Surgical and Perioperative Care

The question of when to suspend and restart SRIs perioperatively frequently arises in hospital settings. Available data regarding bleeding risk with SRI use in this context are highly variable and dependent on the specific procedure, coprescribed agents, and patient characteristics. Studies on bleeding risk and SRIs, organized by procedure type, are summarized in Table 1 in part 1 of our series.1

There is a modest association between SRI use and increased risk of certain perioperative and postoperative complications, including increased risk of bleeding requiring blood transfusions, hospital readmissions, and mortality.28-30 Most of these studies in this domain are observational or case-control in design, have mixed results, and are difficult to apply to individual patients.

In 1 review, 7 of 10 studies reported no significant difference in mortality, and 5 of 7 showed no difference in risk of bleeding.31 Another observational study that examined the rate of perioperative complications in more than 500,000 patients who were prescribed SSRIs at more than 375 hospitals found an increased risk of bleeding (OR, 1.09; NNH, 424), higher mortality (OR, 1.2; NNH, 839), and increased risk of readmission within 30 days (OR, 1.22; NNH, 75) in the SSRI population, regardless of surgery type or concomitant use of anticoagulants.32

It is not clear from these observational studies whether SRIs themselves are responsible for the higher rates of complications or whether the higher rates are due to confounding factors. For example, in the above study, the patients taking SSRIs were found to have higher rates of comorbid medical illnesses associated with worse surgical outcomes, including chronic obstructive pulmonary disease (COPD) and obesity.32

One retrospective matched-cohort study found that preoperative SRI use was associated with increased risk of requiring a blood transfusion postoperatively, but only in the first 24 hours after surgery. Patients who resumed SRI use in the 72 hours after surgery did not have an increased risk of requiring a blood transfusion and were significantly less likely to require transfusion than patients who restarted later or not at all (43.2% vs 60.3%, respectively).33 Taken together, these results suggest that, although preoperative SRI use may predispose patients to adverse bleeding in the brief window directly after surgery, restarting SRIs after surgery is likely safe.

When examining specific perioperative circumstances, higher rates of intraoperative blood loss and increased rates of blood transfusion have been observed in patients who underwent various orthopedic surgeries and concomitantly took SRIs.30,34 For cardiac procedures, a meta-analysis of observational studies in coronary artery bypass graft (CABG) surgery in patients taking SSRIs showed an increased risk of transfusion but without increased risk of mortality.35 These findings led the investigators to recommend continuing SRI use prior to elective procedures.36 One study that examined smaller, elective, or nonvascular procedures described a significantly increased risk that patients taking SSRIs will require reoperation due to bleeding,27 while a dental study reported no increased risk of bleeding during tooth extractions for patients who are taking SSRIs.37

Decisions about withholding SRIs are further complicated by characteristics of individual agents. Medications with short half-lives, such as venlafaxine and paroxetine, are fully excreted within days (with a concomitant increased risk of discontinuation syndrome), whereas SRIs with longer half-lives, such as fluoxetine, require weeks to be excreted. Additionally, different SRIs have variable CYP450 enzyme inhibition profiles and differing impacts on serum levels of other medications the patient is taking.

In summary, patients taking SRIs preoperatively have a small increased risk of perioperative complications (specifically, increased bleeding and requiring transfusions intra- or postoperatively), but the absolute risk appears to be small and unlikely to be clinically significant for most patients. The available limited data do not support the suspension of SRIs post- or perioperatively. The concern for SRI-induced surgical bleeding should be limited to those patients who have existing hematologic concerns, such as severe thrombocytopenia or von Willebrand disease; those who are coprescribed NSAIDS, antiplatelet agents, or warfarin; and those who are undergoing a procedure with a high risk of intraoperative blood loss.


Pregnancy is a period of increased risk for both depression and anxiety.38,39 Untreated depression during pregnancy is associated with negative fetal and maternal outcomes in pregnancy, childbirth, and the postpartum period, including development of the newborn. Examples include increased likelihood of preterm birth and preeclampsia for the mother, and low birth weight and elevated risk for psychiatric disorders in the offspring.40-43

SRIs are the first-line antidepressant medications in pregnancy and the peripartum period due to their favorable safety profile in pregnancy. Sertraline is considered the preferred agent during pregnancy and breastfeeding, while paroxetine is associated with a slight increased risk of teratogenicity. Matching overall trends in the general population over the last several decades, the use of SRIs in the pregnant/peripartum population has increased in recent years.44

From implantation to parturition, pregnancy is accompanied by a multitude of physiological changes that alter hemostasis. These include placental embedding into the uterine wall, a 10% decrease in platelet count, complex and often drastic changes in clotting factors, and large shifts in hormones (eg, estrogen, progesterone) that increase the risk of thrombi or otherwise affect coagulability and the vasculature.45-47 Although most of these changes are pro-coagulative, some of the most feared complications of pregnancy involve high-volume blood loss, including ectopic pregnancy, placenta accreta or previa, and postpartum hemorrhage (PPH). PPH, in particular, is 1 of the major causes of maternal mortality and morbidity related to pregnancy and has increased in prevalence in recent years.38,48-50

Evidence for increased risk of bleeding in pregnant patients who are taking SRIs is conflicting. In an analysis of data from the US Food & Drug Administration (FDA) Adverse Events Reporting System, SRI use in pregnancy was tolerated well and not associated with increased risk of PPH.38 In a 2014 cohort study of more than 57,000 Norwegian women, no association was found between antidepressant use in pregnancy and obstetric hemorrhage.51 Nevertheless, a 2016 systematic review published results indicating that the odds for developing PPH were 1.32-fold higher (95% CI, 1.17-1.48) in antidepressant users (of both SRIs and non-SRIs) compared with individuals who had not taken antidepressants.52 The authors of a 5-year Swedish cohort study also concluded that SSRI use in pregnancy was associated with increased risk of both PPH and postpartum anemia. A Swedish register-based study of more than 31,000 pregnant women found that those who took SSRIs during their pregnancy were 34% more likely to have PPH.53

Although SRIs are generally safe in pregnancy, the available data suggest that there is likely to be an increased risk of PPH and other adverse bleeding-related events; however, the absolute risk remains low. This is just one of many factors that should be considered when deciding to start, restart, dose-reduce, or stop antidepressants in pregnancy. Other factors are listed in Table 2. The informed psychiatric clinician should work with each patient to help them understand the most salient factors to consider and collaborate on an optimal treatment plan tailored to the individual patient.

TABLE 2. Factors to Consider When Deciding to Start, Restart, Dose- Reduce, or Stop Antidepressants During Pregnancy

Table 2. Factors to Consider When Deciding to Start, Restart, Dose- Reduce, or Stop Antidepressants During Pregnancy

Hormonal Therapy

Estrogen-based hormone replacement therapy (HRT) is commonly prescribed in postmenopausal and perimenopausal women, and it is a part of gender-affirming hormone therapy (GAHT) in transfeminine individuals. All estrogen preparations are associated with an increased risk of thrombosis and hypercoagulability, although the risk appears to be lower for preparations that are administered transdermally.54-56 Notably, higher thrombosis risk likely means lower bleeding risk overall, but it may also portend a higher risk of exposure to anticoagulant agents as described in part 1 of our series.1

SRIs are commonly used in postmenopausal women for both psychiatric and menopause-related indications (namely, the management of hot flashes).57-60 Research suggests that post- and perimenopausal individuals with depression who are receiving both HRT and treatment with SSRIs experience an improved quality of life when compared with individuals who are receiving treatment with SSRIs alone.61 In gender-affirming care, SRI antidepressants are also a commonly coprescribed class of medication with GAHT.62,63

Despite these associations, the investigators were unable to find any research specific to bleeding events in patients taking both SRI antidepressants and HRT/GAHT. More research is required to direct clinicians regarding the use of SRIs and the risk of bleeding in individuals who receive HRT/GAHT. Testosterone-based GAHT for transmasculine individuals also carries risks, notably polycythemia and liver disease, although bleeding appears to be a less common concern.

Concluding Thoughts

SRIs are commonly prescribed medications in many clinical situations. SRIs carry a slightly increased risk in bleeding due to their inhibition of platelet aggregation and vasoconstriction, both of which facilitate clotting. Although this effect is negligible and clinically insignificant for most patients, it may be relevant for patients with other medical or surgical illness depending on the specific illness, associated procedures, or coprescribed medications. The informed clinician will soon find that the literature on SRI-induced bleeding is limited and requires interpretation for each individual to evaluate the impact of any other medical conditions or polypharmacy that influences their overall bleeding risk.

Several take-home points are clinically noteworthy. Coprescribing an acid-suppressing agent plus an SRI can decrease the risk of GI bleeding in patients who also take antiplatelet agents or NSAIDs. Data are insufficient to consider dose adjustment or discontinuation of SRI therapy in patients undergoing emergent, minor, or elective procedures, and in those receiving heparin products or novel anticoagulant medications. Patients who receive SRIs are more likely to require blood transfusions during or immediately following major or vascular surgical procedures. It is unclear whether transfusions or SRI use contribute to poorer outcomes or higher mortality. It is also unclear whether stopping SRIs prior to these procedures reduces the risk of bleeding.

It is important to consider the precipitation of SRI withdrawal syndromes, especially for shorter-acting SRI agents, that can occur with abrupt discontinuation of an SRI. The elimination of drug-drug interactions after SRI discontinuation may require dose adjustment of other interacting drugs. Future research would be helpful to guide safe clinical prescription of SRIs or other antidepressants in patients with malignancy, critical illness, or organ failure.

Dr Robbins-Welty is chief resident of the combined Internal Medicine & Psychiatry residency program in the departments of medicine and psychiatry at Duke University Medical Center in Durham, North Carolina. Dr Tuck is a medical instructor in the department of psychiatry and behavioral sciences at Duke University Medical Center.
Dr Marchant is affiliated with the department of psychiatry at Westmead Hospital and the department of consultation-liaison psychiatry at Concord Repatriation General Hospital in Sydney, Australia. Dr Gleason is affiliated with the Department of Consultation-Liaison Psychiatry at Concord Repatriation General Hospital and the Florey Institute of Neuroscience and Mental Health at the University of Melbourne in Melbourne, Australia. Dr Key is an assistant professor in the department of psychiatry & behavioral sciences; a courtesy assistant professor in the department of oncology; and program director of the consultation-liaison psychiatry fellowship at the University of Texas at Austin Dell Medical School in Austin, Texas. Dr Lubrano di Ciccone is an associate professor in the department of behavioral medicine at Moffitt Cancer Center in Tampa, Florida. Dr Chopra is affiliated with the University of Texas MD Anderson Cancer Center in Houston, Texas. Dr Mojtahedzadeh is affiliated with the department of psychiatry and Simms/Mann-UCLA Center for Integrative Oncology at the University of California, Los Angeles, in California. Dr Fonseca is a fellow in consultation-liaison psychiatry at the Mayo Clinic in Rochester, Minnesota. Dr Amonoo is an assistant professor of psychiatry at Brigham and Women’s Hospital in Boston, Massachusetts. Dr DeSimone is a clinical assistant professor at Philadelphia College of Osteopathic Medicine and a consultation-liaison psychiatrist at Bayhealth Medical Center in Dover, Delaware. Dr McFarland is an associate professor in the departments of psychiatry and medicine at the Wilmot Cancer Centre of the University of Rochester Medical Center in Rochester, New York.


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