Which medications can cause tachycardia?

Medications That Cause Tachycardia

Multiple drug classes can induce tachycardia through various mechanisms, with psychotropic medications, respiratory drugs, and certain cardiovascular agents being the most common culprits in clinical practice.

High-Risk Psychotropic Medications

Antipsychotic Agents

• Both typical and atypical antipsychotics significantly increase the risk of severe tachycardia (heart rate ≥130 bpm), with an adjusted odds ratio of 4.09 after controlling for confounding factors 1
• Second-generation (atypical) antipsychotics are commonly encountered in patients experiencing severe tachycardia (70% of cases), though first-generation agents also contribute 1
• The risk increases in a dose-dependent manner for both typical (incidence-rate ratios 1.31-2.42) and atypical antipsychotics (incidence-rate ratios 1.59-2.86) 2

Antidepressants

• Tricyclic antidepressants (TCAs) carry the highest risk among antidepressants, with an odds ratio of 1.69 for cardiac arrest 2
• SSRIs (selective serotonin reuptake inhibitors) increase cardiac arrest risk with an odds ratio of 1.21, particularly in older patients (median age 74 years) 2
• Citalopram and escitalopram have documented QT-prolonging effects, leading to FDA and EMA dose restrictions, especially for patients over 60 years 2
• SNRIs (serotonin-norepinephrine reuptake inhibitors) showed no significant association with cardiac arrest in registry studies 2

Mood Stabilizers

• Lithium can cause bradycardia, T-wave changes, and AV-block, though reports on QT prolongation are divergent 2
• Anticonvulsants (carbamazepine, lamotrigine, valproate) are generally not associated with severe arrhythmias 2

Opioid Addiction Treatment

• Methadone causes pronounced QT-prolongation and multiple cases of torsades de pointes, requiring baseline ECG and follow-up monitoring, particularly when daily doses exceed 100 mg 2
• Buprenorphine causes far less QT prolongation compared to methadone 2

Respiratory Medications

Beta-2 Adrenergic Agonists

• Salbutamol is among the drugs most likely to cause supraventricular tachycardia based on pharmacovigilance data 3
• A single dose of β2-agonists increases mean heart rate by 9.1 beats/min and increases the relative risk for adverse cardiovascular events (including atrial fibrillation) to 2.54 4
• Paroxysmal atrial fibrillation and supraventricular tachycardia occur in 56% (10 of 18) of COPD patients with structural heart disease treated with salbutamol 4
• Formoterol is also identified as highly likely to cause supraventricular tachycardia in database mining 3

Theophylline and Aminophylline

• Theophylline is strongly associated with supraventricular tachycardia, particularly with short-term use (relative risk 4.0 for supraventricular tachycardia) 5
• Short-term theophylline use shows a relative risk of 1.8 for overall arrhythmias and atrial fibrillation 5
• Seven out of 15 patients (47%) with stable COPD developed atrial premature contractions and atrial fibrillation following oral aminophylline 4
• Atrial fibrillation with rapid ventricular response can occur at therapeutic plasma levels 4
• Theophylline is identified as one of the six drugs most likely to cause supraventricular tachycardia in comprehensive database analysis 3

Corticosteroids

• Oral corticosteroids carry significant risk, especially at treatment initiation, with a relative risk of 2.6 for overall arrhythmias and 2.7 for atrial fibrillation during short-term use 5
• Long-term oral steroid use is associated with supraventricular tachycardia (relative risk 2.1) 5
• Inhaled steroids show no increased risk with short-term use 5

Antimuscarinic Agents

• Long-term antimuscarinic use is weakly associated with supraventricular tachycardia (relative risk 1.7) 5

Cardiovascular Medications

Calcium Channel Blockers

• Nifedipine produces the most vasodilation among calcium channel blockers and has the highest potential for causing reflex tachycardia 6
• Side effects related to reflex tachycardia and palpitations occur but are not frequent 6
• Verapamil has the most negative chronotropic effects and is least likely to cause tachycardia among this class 6

Chemotherapy Agents

Taxanes

• Paclitaxel is identified as one of the six drugs most likely to cause supraventricular tachycardia based on adverse event database analysis 3

Other Antidepressants

SNRIs

• Venlafaxine is among the drugs most likely to cause supraventricular tachycardia according to pharmacovigilance data mining 3
• Paroxetine (an SSRI) is also identified as highly likely to cause supraventricular tachycardia 3

Bisphosphonates

Zoledronic Acid

• Once-yearly intravenous zoledronic acid increases the risk of serious atrial fibrillation (1.3% vs 0.5% in placebo; P < 0.001) 4
• Most events (47 of 50 cases) occur more than 30 days after infusion when blood levels are undetectable 4
• Multiple mechanisms include release of proinflammatory cytokines, calcium abnormalities, and shortening of atrial action potential duration 4

Antihistamines

Second-Generation H1-Antagonists

• Terfenadine and astemizole have documented arrhythmogenic effects through interference with histaminergic cardiac effects 7
• Histamine itself possesses arrhythmogenic properties, increasing sinus rate and ventricular automaticity while slowing AV conduction through H2-receptor mediation 7

Clinical Pitfalls and Monitoring Recommendations

• Polypharmacy significantly amplifies risk: Patients on multiple tachycardia-inducing agents require heightened vigilance 2, 1
• Baseline ECG is essential before initiating high-risk medications (methadone, antipsychotics, citalopram/escitalopram) 2
• Temperature, anticholinergic burden, and metabolic factors (hypoglycemia) must be assessed when tachycardia occurs, as these confounders can amplify drug effects 1
• Age-related vulnerability: Older patients (>60 years) require dose reductions for QT-prolonging antidepressants 2
• Structural heart disease and heart failure dramatically increase susceptibility to drug-induced arrhythmias 2, 4