PDE5 inhibitors, while promising in cardiovascular treatments, face several limitations including their interaction with nitrates used in heart conditions which can lead to severe hypotension. Their long-term safety profile in the cardiovascular context is not fully understood yet either. Future research could focus on exploring the molecular mechanisms of PDE5 inhibitors in cardiac tissue and developing strategies to mitigate potential side effects. Additionally, clinical trials are crucial to ascertain their efficacy across different cardiovascular conditions beyond pulmonary hypertension where they’re currently most applied. This could potentially widen their therapeutic application significantly.