Sildenafil and Tadalafil Interaction
Sildenafil and Tadalafil have a potentially harmful interaction with 95% confidence. Do not combine PDE5 inhibitors. Additive pharmacological effect on cGMP accumulation increases risk of severe hypotension, priapism, and other adverse events with no additional therapeutic benefit. Both compounds affect the blood vessels and gonads, so monitoring these systems is recommended.
Compound Profiles
Sildenafil
PDE5 Inhibitor | Erectile Function & Pulmonary Hypertension
Sildenafil selectively inhibits phosphodiesterase type 5 (PDE5), the enzyme responsible for the hydrolysis and degradation of cyclic guanosine monophosphate (cGMP) in vascular smooth muscle. During sexual arousal, nitric oxide (NO) is released from nerve terminals and endothelial cells in the corpus cavernosum, activating soluble guanylate cyclase and increasing intracellular cGMP concentrations.
View full profileTadalafil
PDE5 Inhibitor | Erectile Function & Blood Flow
Tadalafil selectively inhibits phosphodiesterase type 5 (PDE5), the enzyme responsible for degrading cyclic guanosine monophosphate (cGMP) in smooth muscle tissue. During sexual stimulation, nitric oxide (NO) is released in the corpus cavernosum, activating guanylate cyclase and increasing cGMP levels.
View full profileCombined Organ Load
Shared Safety Flags
Frequently Asked Questions
Can I take Sildenafil with Tadalafil?
Combining Sildenafil with Tadalafil is not recommended. Do not combine PDE5 inhibitors. Additive pharmacological effect on cGMP accumulation increases risk of severe hypotension, priapism, and other adverse events with no additional therapeutic benefit.
Is Sildenafil and Tadalafil safe together?
This combination carries significant risk. Do not combine PDE5 inhibitors. Additive pharmacological effect on cGMP accumulation increases risk of severe hypotension, priapism, and other adverse events with no additional therapeutic benefit. Consult a healthcare professional before combining.
What are the interactions between Sildenafil and Tadalafil?
Do not combine PDE5 inhibitors. Additive pharmacological effect on cGMP accumulation increases risk of severe hypotension, priapism, and other adverse events with no additional therapeutic benefit. This assessment has 95% confidence and is based on documented research data.
How should I time Sildenafil and Tadalafil?
Sildenafil has a half-life of ~3-5 hours and Tadalafil has a half-life of ~17.5 hours. No specific timing requirements identified for this combination, but separating administration can help monitor individual effects.
This interaction analysis is compiled from research literature and pharmacological mechanism data. Always consult a healthcare professional before combining compounds.