Sildenafil Citrate

Sildenafil: What Is It and How Does It Work?

Sildenafil Citrate, commonly used to treat erectile dysfunction, belongs to a group of molecules known as Phosphodiesterase 5 (PDE 5) inhibitors. It is commonly known by several brand names such as Viagra, Cenforce, and Revatio.

Beyond its primary use for erectile dysfunction, Sildenafil Citrate is also prescribed for pulmonary arterial hypertension (PAH), where it helps improve blood flow and reduce pressure in the lungs.

Basic Information

Sildenafil Citrate is the citrate salt form of Sildenafil, a molecule that relaxes blood vessels and enhances blood flow. Below are its key features:

1. Chemical Structure & Formula: C₂₈H₃₈N₆O₁₁S
2. Discovered in: The chemical was found at Pfizer laboratories in 1989 during research for a chest pain treatment.
3. FDA approval: The Food and Drug Administration (FDA) approved it for the treatment of ED in March 1998. India’s Central Drugs Standard Control Organisation (CDSCO) approved it for pulmonary arterial hypertension (PAH) in 2007 and for ED in 2013.
4. Regulatory status: In India, Sildenafil Citrate is a prescription-only medication regulated by the CDSCO and cannot be obtained over the counter.

Uses of Sildenafil Citrate

Sildenafil Citrate helps to treat conditions such as Erectile Dysfunction (ED) and Pulmonary Arterial Hypertension (PAH).

• Erectile Dysfunction (ED)

Erectile dysfunction hampers the ability to get or maintain an erection. Although it is not uncommon to sometimes face this issue, a persistent flaccid penis is a cause for concern.

If you face any of the following symptoms, consult a doctor:

• Flaccid penis
• Reduced sexual desire
• Trouble keeping an erection

This drug helps to overcome these symptoms, thus improving your performance and sexual life. Viagra, the first branded formulation by Pfizer, contains Sildenafil Citrate as its active ingredient.

• Pulmonary Arterial Hypertension (PAH)

PAH is a condition characterised by high blood pressure between the heart and lungs, affecting the right side of the heart and pulmonary arteries. If you face any of these symptoms, talk to your doctor immediately:

• Shortness of breath while resting
• Fast pulse
• Fatigue
• Blue or gray skin

Sildenafil Citrate helps manage PAH symptoms by improving blood circulation, enhancing heart function, and increasing overall quality of life. Revatio, another branded formulation of Sildenafil Citrate, is specifically used to treat PAH.

Off-Label Uses  of  Sildenafil Citrate

In addition to its approved uses, Sildenafil Citrate is sometimes prescribed for other conditions when alternative treatments are unavailable. These are considered off-label uses, as the drug is not officially authorised for these conditions but may still provide therapeutic benefits.

Sildenafil Citrate is commonly used to treat Secondary Raynaud’s Phenomenon, a condition in which reduced oxygen supply and narrowed blood vessels cause the hands and feet to turn blue. This condition is often associated with underlying health issues such as connective tissue diseases, smoking, carpal tunnel syndrome, and blood vessel disorders.

Unlike Primary Raynaud’s Disease, which occurs without an underlying cause, Secondary Raynaud’s Phenomenon is less common and typically develops around the age of 40.

Sildenafil pills have been explored as a potential treatment for Female Sexual Arousal Disorder (FSAD) by increasing blood flow to the genital area, potentially improving arousal and sensitivity.

How It Works

Sildenafil Citrate medication enhances blood flow by targeting cyclic guanosine monophosphate (cGMP), a molecule responsible for smooth muscle relaxation.

Commonly, PDE5 enzymes break down cGMP, leading to muscle contraction and restricted blood flow. Sildenafil Citrate inhibits PDE5, allowing cGMP to persist, leading to smooth muscle relaxation and better blood flow to the penis, aiding erection during sexual stimulation.

This mechanism helps maintain an erect penis when sexually stimulated. The same mechanism relaxes the smooth muscles in the lungs, reducing pressure on the heart and improving oxygenation.

Common Side Effects

Sildenafil Citrate causes some common and rare side effects.  Common side effects tend to go away after your body adjusts to the medicine. However, seek medical attention immediately if you experience rare side effects.

Here is a list of common side effects:

• Nausea
• Headaches
• Flushing
• Diarrhea
• Bloody nose
• Warm skin
• Sneezing
• Muscle pain
• Skin redness
• Breathing difficulty
• Pain around the eyes and cheekbones
• Stomach discomfort
• Stuffy nose
• Dizziness

Below are rare symptoms that are associated with sildenafil:

• Anxiety
• Sudden vision loss
• Chest pain
• Confusion
• Blurred vision
• Double vision
• Dry mouth
• Dry eyes
• Behavioural change
• Excessive hunger
• Migraine
• Hand numbness
• Pain in the joints
• Seizures
• Skin rash or hives
• Muscle twitching
• Shakiness
• Sore throat

There may be other side effects that are not listed here. If you think you are experiencing a side effect from taking sildenafil, contact your doctor immediately. Additionally, if an erection lasts for more than 4 hours and is painful, consult your doctor.

Avoid Sildenafil if you have underlying heart conditions. Please do not take it with nitrate-containing medications, as this can cause a dangerous drop in blood pressure. Inform your doctor about any existing medical conditions or medications before use.

Available Medicines

Here is a list of companies providing Sildenafil Citrate tablets.

Frequently Asked Questions

• What is the Sildenafil Citrate brand name?

Viagra and Revatio are some of the most popular brand names for Sildenafil Citrate.

• Who should avoid Sildenafil Citrate?

People with underlying heart disease or liver problems should not take this medicine. Always let your doctor know about any heart problems you have now or have had in the past.

• Is Sildenafil Citrate safe to use daily?

It can be taken daily, but it is advised to leave at least a 24-hour gap between doses. The drug is typically prescribed on an as-needed basis, rather than for daily use, unless specifically advised by a healthcare provider.

• Can women use Sildenafil?

Sildenafil Citrate has been studied as a potential treatment for Female Sexual Arousal Disorder (FSAD), as it may enhance blood flow to the genital area, improving arousal and sensitivity.

• What food or drink should I avoid when taking Sildenafil?

Avoid grapefruit juice when taking Sildenafil for PAH, as it can interfere with the drug's effectiveness. However, for ED, you can eat and drink normally. Alcohol should be avoided, as it may reduce the drug's effectiveness and impair erection quality.

Disclaimer: For information purposes only; it does not replace professional advice. Seek a doctor before consuming Sildenafils  Tablets.

Reference Links:

https://www.drugs.com/history/revatio.html

https://www.webmd.com/drugs/2/drug-7418/sildenafil-oral/details

https://pubmed.ncbi.nlm.nih.gov/16291984/

https://www.ncbi.nlm.nih.gov/books/NBK558978/