What Are PDE5 Inhibitors and How Do They Work?
PDE5 inhibitors are a class of medications that improve blood flow to the penis by blocking the enzyme phosphodiesterase type-5 (PDE5). This action boosts the levels of nitric oxide and cyclic GMP (cGMP). These two key molecules responsible for smooth muscle relaxation and vasodilation.
These medicines are primarily used to treat erectile dysfunction (ED) and pulmonary arterial hypertension (PAH).
Common side effects may include headache, flushing, nasal congestion, or dizziness usually mild and temporary.
Drugs like Sildenafil (Viagra) and Tadalafil (Cialis) have transformed ED treatment worldwide. But how exactly do they work — and which one is best for you? Let’s break it down.
What Are PDE5 Inhibitors?
PDE5 inhibitors block the enzyme phosphodiesterase type-5, found in the smooth muscles lining blood vessels. When this enzyme is inhibited, blood vessels widen, improving circulation — especially to the penile region, which helps men achieve and maintain erections.
Originally developed for heart and lung conditions, these medicines later proved highly effective for managing erectile dysfunction and premature ejaculation.
However, their effectiveness may vary in men with conditions like diabetes, cardiovascular disease, or nerve damage after prostate surgery. In such cases, medical guidance is crucial before starting treatment.
Note that, based on the type of ED use, PDE5 inhibitors are considered, where physical ED is well maintained with these vasodilatory medicines. Thus, understanding the difference between the types of ED, like psychological ED vs physical ED, is crucial to choosing the right treatment.
Where are PDE5 enzymes located?
PDE5 enzymes degrade cGMP and are distributed throughout the body, functioning in various tissues.
They are found in the smooth muscle of different parts of the body, like:
- Corpus cavernosum
- Skeletal muscle
- Cerebellar
- Pancreatic tissues
- Vascular and visceral smooth muscle
- Platelets
- Kidneys and lungs
How do PDE-5 inhibitors work?
PDE5 inhibitors improve blood flow to the penile area, which is essential for erections.
During Erectile dysfunction, PDE5 breaks down cGMP, reducing blood flow.
Thus, PDE5 inhibitors stop this process and boost cGMP to improve erections.
PDE5 inhibitors are FDA-approved to treat the following conditions:
Erectile Dysfunction (ED):
Widely used by men worldwide, PDE5 inhibitors treat ED, helping men achieve and sustain erections.
Benign Prostatic Hyperplasia (BPH):
These drugs address prostate gland enlargement, which causes urination problems, affecting 70% of US males in their 60s.
Pulmonary Hypertension (PH):
Certain PDE5 inhibitors treat Pulmonary hypertension, a severe condition involving high blood pressure in the lung arteries.
Symptoms include shortness of breath, chest pain, rapid heartbeat, and fatigue.
However, early treatment may help manage PH symptoms effectively and prevent life-threatening risks.
How do you take PDE5 inhibitors?
Take PDE5 inhibitors like Viagra, Cialis, and Levitra as directed, 30-60 minutes before sex.
Don’t take more than one in 24 hours. While Cialis has a daily low-dose option, high-fat meals can delay Viagra and Levitra.
It can be taken with or without food, but limit alcohol to avoid reduced efficacy or side effects.
Don’t take PDE5 inhibitors with nitrates or certain blood pressure meds.
Always consult your doctor for the correct dose and instructions so it’s safe and effective.
What is the Best PDE5 inhibitor?
PDE5 inhibitors, introduced in the late 1990s, are effective for treating erectile dysfunction (ED).
Also, benign prostatic hyperplasia (BPH) and pulmonary hypertension.
Below, we have listed the best PDE5 inhibitors available in the market:
Viagra
Viagra is the first FDA-approved PDE5 inhibitor for erectile dysfunction (ED) and remains the leading ED Pill.
Viagra dosage is available in 25mg to 100mg tablets; you need to take it 30 minutes before sexual activity.
Its Effects typically begin within 30 minutes to 1 hour and last 4 to 5 hours.
Consider using Viagra as prescribed to prevent its possible side effects.
Viagra requires sexual stimulation to work and is available as both a brand name and a lower-cost generic option(Generic Viagra).
Revatio
Revatio, containing Sildenafil, is FDA-approved to treat pulmonary arterial hypertension (PAH).
The condition causes high blood pressure in the vessels connecting the heart and lungs.
While Revatio and Viagra share the same active ingredient, they are not identical.
Using Revatio can help ease the workload on the heart by improving blood flow in the affected blood vessels.
The typical adult dose is 20mg, up to 80mg, thrice daily.
Revatio is the only approved PDE5 inhibitor for children, with dosage based on body weight.
Generic options offer a more affordable alternative.
Cialis
Cialis, with its generic Tadalafil, is FDA-approved to treat ED and benign prostatic hyperplasia (BPH).
It lasts longer than other PDE5 inhibitors and is ideal for daily use or spontaneous sexual activity.
Dosage Options:
- Daily: 2mg to 5mg, once a day.
- As Needed: 5mg to 20mg, taken 30 minutes before sexual activity, as Cialis lasts for 36 hours.
For BPH, the typical dose is 5mg daily, which can also address ED.
Cialis is available as a brand name or generic at a lower cost.
Its long-lasting effects make it a top choice for BPH and urinary symptom relief.
Adcirca
Adcirca, containing Tadalafil, treats pulmonary arterial hypertension (PAH) in adults.
It includes the same action as relaxing blood vessels between the heart and lungs, which eases the tension of the heart.
While it shares the same active ingredient as Cialis, the two are not identical.
Adcirca lasts longer than Revatio, requiring less frequent dosing.
The typical dose is 40 mg once daily, as brand-name and generic options.
Vardenafil
Vardenafil is also an FDA-approved PDE5 inhibitor for ED, available in generic form and under the brand names Levitra and Staxyn.
It comes as oral or orally disintegrating tablets for those with difficulty swallowing.
Typical doses range from 5mg to 20mg, taken 1 hour before sexual activity.
Vardenafil works faster than any other pill, like Viagra and Cialis.
It starts within 15 minutes (with sexual arousal) and lasts about five hours.
Stendra
Stendra (Avanafil), a newer FDA-approved PDE5 inhibitor, is prescribed for erectile dysfunction.
It also works faster than Sildenafil and Tadalafil.
Available in tablet form, its typical dosage ranges from 50mg to 200mg, taken 15 minutes before sexual activity.
100mg or higher doses act within 15 minutes, while 50mg takes about 30 minutes.
Stendra is only available as a brand-name medication.
What are the Side effects of PDE5 inhibitors?
PDE5 inhibitors are generally well-tolerated but may cause side effects, including:
- Nasal congestion
- Headaches
- Dyspepsia
- Facial flushing
- Cold-like symptoms
- Back or muscle pain
Consult a doctor if side effects persist or worsen.
What are the Precautions to take while using PDE5 inhibitors?
- Consult a Doctor: Always get approval and use the prescribed dosage. Avoid doubling or exceeding the dose.
- Avoid Nitrates: Do not combine PDE5 inhibitors with nitrates, as this can cause severe hypotension.
- Medical Conditions: Tell your doctor about heart issues, kidney/liver disease, or high blood pressure. However, using PDE5 inhibitors under certain medical conditions can be unsafe.
- Monitor Blood Pressure: PDE5 inhibitors can lower blood pressure. Avoid combining them with alpha-blockers or blood pressure medications.
- Diet: Avoid heavy, fatty meals before use, which may delay absorption and effects.
- Grapefruit and Alcohol: Avoid grapefruit juice and alcohol to reduce the risk of side effects. Using these items can affect the working of PDE5 inhibitors and also induce unwanted effects.
Do you know?
PDE5 inhibitors were discovered in the late 1980s while researching treatments for angina. However, Sildenafil (Viagra) was accidentally found effective for ED. Later, it was approved in 1998 for erectile dysfunction, revolutionising ED treatment.
Summary
PDE5 inhibitors effectively treat conditions like ED, BPH, and pulmonary hypertension.
The results may vary by individual as per their response to the treatment.
The best option depends on your age and medical condition.
However, consider using a PDE5 inhibitor under the doctor's advice.
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Caffeine is a nonselective PDE inhibitor but does not specifically target PDE5, which is inhibited by drugs like Viagra.
Kaempferia parviflora (black ginger) naturally contains PDE5 inhibitors and is used in some ED and pulmonary hypertension supplements.
Vardenafil acts the quickest, usually taking effect within 10 minutes for ED treatment.
PDE5 inhibitors are not suitable for individuals with certain conditions, such as:
- Recent history of heart attack, stroke, or life-threatening arrhythmia within six months.
- hypertension (high blood pressure) or Resting hypotension (low blood pressure).
- Concurrent use of alpha-blockers, as it may cause severe blood pressure drops.
Always consult a doctor to determine if PDE5 inhibitors are safe for your condition.
PDE5 inhibitors may boost testosterone levels, especially when combined with testosterone therapy. This combination has shown improved erectile function in hypogonadal men. Also, it has demonstrated higher scores on the International Index of Erectile Function (IIEF).
Alternatives to PDE5 inhibitors include lifestyle changes, hormone therapy, and vacuum erection devices. Also, penile injections, intraurethral suppositories, and surgical options like penile implants may help. These options may help when pills are ineffective or not suitable for the patient.
Clinical studies show that PDE5 inhibitors can help improve heart function in systolic heart failure and reduce cardiovascular events. Evidence suggests benefits in high-risk patients; it has shown better ventricular performance. Also, PDE5 inhibitors lower mortality rates among long-term users.