Tadalafil Adverse Effects: Dizziness and Diarrhea
Dizziness and diarrhea are known adverse reactions of tadalafil. [1] In an elderly patient, these symptoms should be treated as potential blood pressure–lowering and/or dehydration adverse effects and tadalafil should be withheld pending clinical assessment. [1]
Immediate Symptom Assessment
Vital signs should be assessed, with particular attention to orthostatic blood pressure and pulse, given the blood pressure–lowering effects associated with tadalafil. [1] Hydration status should be assessed because diarrhea can contribute to volume depletion. [1] Review should be performed for concurrent agents that can increase hypotension risk, including nitrates, alpha-blockers, and antihypertensives. [1]
Medication Management
Tadalafil should be discontinued temporarily while dizziness and diarrhea are active, pending evaluation of severity and contributing drug interactions. [1] Nitrates should not be used concurrently with tadalafil because the combination is contraindicated due to potentiation of hypotensive effects. [1] Caution is required when tadalafil is used with alpha-blockers because additive blood pressure lowering can occur. [1]
Supportive Care for Diarrhea and Volume Depletion
Oral rehydration and general supportive care should be provided for diarrhea to reduce dehydration-related dizziness. [1] Persistent or severe diarrhea with ongoing dizziness should prompt escalation of care for evaluation of hypotension and complications from volume depletion. [1]
Interaction and Dose-Related Review
Alcohol intake should be assessed because substantial alcohol use can increase orthostatic signs and symptoms, including dizziness, when combined with tadalafil. [1] CYP3A4 inhibitor use should be assessed because these agents can increase tadalafil exposure and increase the likelihood of adverse effects; dosing limits may be required in the setting of potent CYP3A4 inhibitors. [1] Renal and hepatic function should be reviewed because tadalafil exposure can be increased in renal and hepatic impairment, which can increase adverse effect risk. [1]
Safety Escalation Criteria
Emergency medical evaluation is indicated for syncope, severe or persistent dizziness with concern for significant hypotension, or other severe systemic symptoms during tadalafil exposure. [1] Emergency evaluation is indicated for serious cardiovascular symptoms temporally associated with tadalafil use. [1]
After Symptom Resolution and Restart Planning
After dizziness and diarrhea resolve, tadalafil restart should be considered only after addressing contributing factors, including medication interactions, hydration status, and organ function. [1] If tadalafil is restarted, dose selection and interval should follow prescribing guidance and account for interaction risk and patient-specific exposure factors. [1]