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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]
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).
The PDE5 inhibitors sildenafil, vardenafil and tadalafil are competitive and reversible inhibitors of cGMP hydrolysis by the catalytic side of PDE5. The structures of vardenafil and sildenafil are similar, they both contain similar structured purine ring of cGMP that contributes their features to act as a competitive inhibitor of PDE5.
As mentioned, Cialis can interact with other PDE5 inhibitors for ED, as well as medications prescribed to treat hypertension (high blood pressure), fungal infections, heart disease, heart failure ...
5α-Reductase inhibitors (5-ARIs), also known as dihydrotestosterone (DHT) blockers, are a class of medications with antiandrogenic effects which are used primarily in the treatment of enlarged prostate and scalp hair loss. They are also sometimes used to treat excess hair growth in women and as a component of hormone therapy for transgender ...
Sildenafil, tadalafil and other treatments for ED all belong to a class of medications called phosphodiesterase type 5 or PDE5 inhibitors, which dilate the blood vessels that supply blood to the ...
Viagra’s main ingredient sildenafil is part of a class of drugs referred to as PDE5 inhibitors, which (unlike non-prescription supplements) are approved by the FDA for the treatment of ED.
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