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All PDE5 inhibitors are generally well tolerated. [1] The occurrence of side effects, or adverse drug reactions (ADRs), with PDE5 inhibitors depends on the dose and type of agent. [1] Headache is a very common ADR, occurring in >10% of patients. Other common ADRs include: dizziness, flushing, dyspepsia, nasal congestion or rhinitis. [6]
PDE5 inhibitor drugs are effective in men regardless of why they have erectile dysfunction — including vascular disease, nerve problems, and even psychological causes. [citation needed] PDE5-inhibiting drugs can cause a number of side-effects, including headache, lightheadedness, dizziness, flushing, nasal congestion, and changes in vision.
The major PDE5 inhibitors (a subset of the phosphodiesterase inhibitors) are sildenafil, tadalafil, vardenafil, and avanafil, and although all share the same mechanism of action each has unique pharmacokinetic and pharmacodynamic properties which dictate their suitability in various conditions and their side effect profile. [3]
Phosphodiesterase-5. A phosphodiesterase inhibitor is a drug that blocks one or more of the five subtypes of the enzyme phosphodiesterase (PDE), thereby preventing the inactivation of the intracellular second messengers, cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) by the respective PDE subtype(s).
A 2018 Cochrane review of studies on men over 60 with moderate to severe lower urinary tract symptoms analyzed the impacts of phosphodiesterase inhibitors (PDE) in comparison to other drugs. [90] These drugs may improve urinary symptoms slightly and reduce urinary bother but may also cause more side effects compared to placebo.
Inhibitors of PDE can prolong or enhance the effects of physiological processes mediated by cAMP or cGMP by inhibition of their degradation by PDE. [13] Sildenafil (Viagra) is an inhibitor of cGMP-specific phosphodiesterase type 5, which enhances the vasodilatory effects of cGMP in the corpus cavernosum and is used to treat erectile dysfunction.
Sildenafil is a potent and selective inhibitor of cGMP-specific phosphodiesterase type 5 (PDE5), which is responsible for degradation of cGMP in the corpus cavernosum. The molecular structure of sildenafil is similar to that of cGMP and acts as a competitive binding agent of PDE5 in the corpus cavernosum, resulting in more cGMP and increased ...
Avanafil acts by inhibiting a specific phosphodiesterase type 5 enzyme found in various body tissues, primarily in the corpus cavernosum penis. [7] Other similar drugs are sildenafil, tadalafil and vardenafil. The advantage of avanafil is that it has very fast onset of action compared with other PDE5 inhibitors.