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Sildenafil Rodinal

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Sildenafil Rodinal

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

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Overview of Sildenafil Rodinal

Quick Facts

Property Description
Active ingredient Sildenafil (INN) / Sildenafil citrate
Form Tablet (oral preparation)
Pharmacological class Phosphodiesterase type 5 (PDE5) inhibitor
Common mechanism Enhances endogenous nitric oxide signaling
Origin Synthetic compound

Defining Sildenafil Rodinal: Composition and Form

Sildenafil Rodinal is a commercially supplied prescription-only medication that is defined by its core active substance, sildenafil, which is commonly prepared as the salt sildenafil citrate. As a single-ingredient product, it is categorized as a synthetic compound and is administered as an oral tablet, a dosage form specifically intended to produce a systemic effect throughout the body. The specific formulation ensures a standardized dose of sildenafil is absorbed into the bloodstream. The active ingredient is clinically recognized for its vascular effects, supporting the drug's position in pharmacotherapy.

Sildenafil Rodinal's Pharmacological Class and General Purpose

Sildenafil Rodinal belongs to the powerful pharmacological class of Phosphodiesterase type 5 (PDE5) inhibitors. The core function of this class is to act as a selective inhibitor of the enzyme cyclic Guanosine Monophosphate (cGMP)-specific phosphodiesterase type 5. This inhibitory action is pharmacologically supported to augment the natural nitric oxide signaling pathway, a process noted to restore vascular reactivity to specific tissues. This mechanism is key, as the general purpose of Sildenafil Rodinal is to facilitate enhanced and sustained blood circulation to target tissues, which assists the body in achieving or maintaining a necessary physical response linked to increased localized blood flow.

Regulatory References

  1. Sildenafil - StatPearls - NCBI Bookshelf
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What side effects are possible with Sildenafil Rodinal?

Possible side effects and safety information

The safety profile of Sildenafil Rodinal is defined by the official classification of its possible adverse reactions and specific usage constraints documented by regulatory authorities. The adverse effects are categorized by frequency and the body system affected, reflecting both clinical trial data and post-marketing reports.

Frequency-Classified Adverse Reactions

The most commonly reported side effects, categorized as Very Common and Common in regulatory documents, are primarily due to the drug's vasodilatory effects. Very Common reactions include Headache. Common reactions include Flushing, Dyspepsia (indigestion), Dizziness, and Visual disturbances (such as a colour tinge or blurred vision).

Reactions categorized as Uncommon or Rare include events such as Priapism (a prolonged erection lasting ge 4 hours), Sudden Decrease or Loss of Hearing, and Non-arteritic Anterior Ischemic Optic Neuropathy (NAION), a condition that can result in decreased or permanent loss of vision. Serious Cardiovascular Events, including myocardial infarction and stroke, have been reported in post-marketing surveillance.

Safety-Related Restrictions

Official prescribing information establishes critical limitations for its use. Sildenafil Rodinal is contraindicated and must not be used by patients taking any form of organic nitrates or nitric oxide donors due to the potential for severe, life-threatening drops in blood pressure. Use is also restricted in individuals with specific pre-existing conditions, such as a recent history of stroke or myocardial infarction, or known hereditary degenerative retinal disorders.

Population Safety Notes

Caution is specified for certain patient groups. Individuals with severe hepatic impairment or severe renal impairment may require particular caution due to the reduced clearance of the active substance. Older adults may also have an increased susceptibility to adverse effects due to potential age-related organ function decline.

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Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory profile for Sildenafil Rodinal overdose is based on the principle of exaggerated pharmacological effects and specific severe outcomes. The management principles are defined by the documented limitations of clearance procedures.

Documented Overdose Manifestations

Overdose manifestations are described as an increased incidence and severity of adverse events seen at normal doses. Clinically, this may include hypotension (decreased blood pressure), headache, and flushing. In studies involving single high exposures, the rate of common adverse effects was notably increased. Patients with severe renal or hepatic impairment may exhibit reduced clearance, leading to higher plasma levels and potential increased severity of adverse reactions following overdose.

Required Emergency Actions

Immediate medical attention is mandated for specific, time-critical manifestations:

  • Seek immediate medical assistance for any erection that persists longer than four hours. Failure to do so carries the risk of penile tissue damage and permanent loss of potency.
  • Seek medical attention immediately if experiencing sudden loss of vision or sudden decrease or loss of hearing, as these events have been reported in temporal association with use.

Supportive Management and Limitations

Management involves the use of standard supportive measures as required by the clinical presentation. It is officially documented that renal dialysis is not expected to accelerate the clearance of Sildenafil due to its extensive plasma protein binding and high metabolism.

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Therapeutic Uses of Sildenafil Rodinal

Quick Facts

  • Addresses: Erectile dysfunction in adult men.
  • Supports: The ability to achieve and maintain a penile erection when sexually stimulated.
  • Manages: Pulmonary arterial hypertension (PAH) to support exercise capacity.

What Sildenafil Rodinal Treats: Main Uses and Benefits

Sildenafil Rodinal is a prescription medicine that offers therapeutic support for specific conditions. Its primary use is to assist adult men who experience erectile dysfunction (ED). When sexual stimulation is present, this medication facilitates the process of achieving or sustaining an erection suitable for sexual activity. It functions to support the natural physiological response required for this purpose, but it does not produce an erection without stimulation.

Sildenafil is also clinically indicated for the management of a serious condition known as pulmonary arterial hypertension (PAH). This involves high blood pressure affecting the arteries in the lungs. In this context, the medication is used to improve the ability to exercise and may contribute to a delay in clinical worsening of the condition. For both conditions, Sildenafil Rodinal serves as a supportive treatment; it does not represent a curative intervention. Consultation with a qualified healthcare professional is necessary for proper assessment and direction of use.

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Eligibility and Restrictions for Use

Sildenafil Rodinal is subject to strict eligibility criteria defined by regulatory authorities to ensure patient safety. Use is absolutely contraindicated in patient populations who are concurrently taking any form of organic nitrates or the guanylate cyclase stimulator riociguat. It must also not be used in patients with certain severe pre-existing conditions, including severe hepatic impairment (Child-Pugh class C), recent history of myocardial infarction or stroke, or severe resting hypotension (blood pressure below 90/50 mmHg).


Eligibility is restricted by age and organ function. The medication is not indicated for individuals under 18 years of age for the ED indication. For Pulmonary Arterial Hypertension (PAH), it is approved for pediatric patients aged 1 to 17 years, although doses higher than recommended are prohibited. In older adults (65 years and over), regulatory labeling recommends considering a lower starting dose due to reduced drug clearance. Patients with severe renal or mild to moderate hepatic impairment also fall under conditional use, where a lower dose should be considered. Furthermore, safety is not established for populations with bleeding disorders or active peptic ulceration. In pregnant and breastfeeding women, adequate safety studies are lacking, and use requires a careful risk-benefit assessment.

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What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for Sildenafil Rodinal is officially documented by regulatory agencies, focusing on pharmacokinetic alterations via metabolism and pharmacodynamic reinforcement of blood pressure effects.

Formal Contraindicated Combinations

Co-administration with certain substance categories is strictly contraindicated (prohibited) due to the risk of severe symptomatic hypotension:

  • Organic Nitrates and Nitric Oxide Donors: Including nitroglycerin and isosorbide dinitrate, in any form, due to dangerous potentiation of vasodilatory effects.
  • Guanylate Cyclase (GC) Stimulators: Including riociguat, due to additive blood pressure lowering effects.

Pharmacokinetic and Exposure Interactions

Sildenafil is primarily metabolized by the hepatic enzyme Cytochrome P450 3A4 (CYP3A4). Interactions that inhibit this enzyme reduce sildenafil clearance and increase systemic exposure, while enzyme induction decreases exposure.

  • CYP3A4 Inhibitors: Potent inhibitors, such as ritonavir and ketoconazole, significantly increase sildenafil plasma concentrations. This pharmacokinetic interaction requires a specific limitation on the maximum allowed dose when co-administered.
  • CYP3A4 Inducers: Substances like bosentan increase the clearance of sildenafil, which leads to reduced sildenafil plasma levels.

Other Documented Interactions

  • Alpha-blockers: Co-administration may lead to symptomatic hypotension due to additive vasodilatory effects, with the greatest risk occurring within four hours of dosing.
  • Food: Taking Sildenafil Rodinal with a high-fat meal is documented to delay the rate of absorption and the onset of its effect.
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Mechanism of Action

Selective Inhibition of the PDE5 Enzyme

Sildenafil's mechanism is defined by its selective molecular intervention in the enzyme-driven signaling cascade that governs vascular smooth muscle function. The drug acts as a highly selective inhibitor of Phosphodiesterase type 5 ( PDE5), an enzyme responsible for breaking down the cellular messenger cyclic Guanosine Monophosphate ( cGMP). By blocking PDE5 activity, Sildenafil directly causes cGMP levels to accumulate in vascular smooth muscle cells.


Augmentation and Modulation of Vascular Tone

This accumulation of cGMP augments the signaling effect initiated by endogenous Nitric Oxide ( NO), which is necessary to start the cascade. The elevated cGMP activates a protein kinase, initiating a cellular sequence that reduces intracellular calcium, resulting in relaxation of the vascular smooth muscle. This specific physiological change is a core hemodynamic event resulting in increased localized blood flow in target tissues. The entire mechanism is conditional on the prior release of NO.

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Dosage and Administration Information

Sildenafil Rodinal is administered via the oral route as a tablet or reconstituted oral suspension, and also as an intravenous (IV) injection for specific clinical uses. The proper administration protocol is strictly defined by the condition being managed.

Usage for Erectile Dysfunction (ED)

The standard starting dose for oral use in adults is 50 mg, taken as needed, approximately one hour before sexual activity. The dose may be adjusted from a minimum of 25 mg up to a maximum of 100 mg, based on individual response. The maximum recommended dosing frequency for this condition is once per day. For the medicine to produce its intended action, sexual stimulation is required. Taking the tablet with a high-fat meal may delay the time of onset.

Usage for Pulmonary Arterial Hypertension (PAH)

The medicine is typically used on a scheduled regimen for PAH. The standard oral dose for adults is 20 mg three times a day (TID), taken approximately four to six hours apart, and may be taken with or without food. The dose may be titrated to a maximum of 80 mg TID if required. The intravenous route is typically administered as a 10 mg bolus injection TID.

Population-Specific Adjustments

Specific starting dose considerations are outlined in official labels for certain populations. A starting oral dose of 25 mg should be considered for ED treatment in patients over 65 years old or those with severe renal or hepatic impairment.

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Recent Clinical Evidence

Research Evidence / Overview of Studies for Sildenafil Rodinal

Evidence for use in Erectile Dysfunction (ED)

In the context of erectile dysfunction, the research foundation is built upon numerous short-term Randomized Controlled Trials (RCTs). These studies were applied in research contexts involving adult men with conditions characterized by functional limitations, spanning various underlying medical causes. Research explored outcomes related to systemic or functional imbalance, with studies examining clinical endpoints such as the rate of successful sexual attempts. Trials also examined patient-reported outcomes describing perceived discomfort. Studies examined various functional measurements, and reported observed patterns in the research populations. Despite the volume of existing research, long-term effects are not fully established. Follow-up durations were limited in the primary registration trials, meaning the long-term maintenance or durability of outcomes reported is not well characterized.


Evidence for use in Pulmonary Arterial Hypertension (PAH)

Sildenafil was evaluated in large, multi-center Randomized Controlled Trials (RCTs) that explored conditions marked by functional limitations, specifically pulmonary arterial hypertension (PAH). Research examined outcomes reflecting daily functioning or activity level, such as the 6-Minute Walk Distance (6MWD). Trials also studied the time elapsed before a patient experienced a clinical worsening event. Data show patterns related to the time to clinical worsening events, but the evidence regarding very long-term survival outcomes remains uncertain. This led to further research exploring different dose patterns, and studies contribute to the broader evidence landscape.


Long-Term Evidence and Durability of Response

Data for long-term outcomes are still emerging, as many of the foundational studies for both conditions were designed to evaluate short-term symptom patterns. These long-term studies describe what has been observed so far regarding the symptom patterns and time to worsening events. However, certainty remains low regarding the very long-term effects of continuous use in the absence of a direct, continuous placebo comparison.


What is Still Uncertain in the Research Landscape

Follow-up durations were limited in the initial efficacy studies, meaning data on the long-term effects of continuous treatment are not fully established. Evidence quality varies across studies, and comparative evidence against other established treatments is lacking in some studies. Research does not determine whether an individual will respond similarly to the group patterns observed. The evidence highlights what is known—and what is still uncertain—and research is ongoing.

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Frequently Asked Questions (FAQ)

Common questions about Sildenafil Rodinal (FAQ)


Q: Is Sildenafil Rodinal the same as regular Sildenafil?

Sildenafil Rodinal is a commercially supplied medication that contains sildenafil citrate as its active ingredient. This is the same active substance found in generic sildenafil and is responsible for the drug’s effects. According to official product information, the specific formulation ensures a standardized and consistent dose of the active substance.


Q: What's the typical time Sildenafil Rodinal stays active in your system?

Official information indicates that the active substance, sildenafil, has a terminal half-life of approximately 3 to 4 hours in most healthy men. The half-life refers to the time it takes for the amount of drug in the body to be reduced by half. This measurement helps understand how quickly the substance is cleared from the body.


Q: Does Sildenafil Rodinal have an effect on a person's blood pressure?

Yes, sildenafil has vasodilatory properties, meaning it relaxes blood vessels. Regulatory documents state that this mechanism results in mild and transient decreases in blood pressure. Because of this effect, the use of Sildenafil Rodinal with certain medications, like organic nitrates, is strictly prohibited due to the potential for a severe drop in blood pressure.


Q: What should you avoid eating or drinking when taking Sildenafil Rodinal?

According to official prescribing information, it is important to avoid a high-fat meal when taking the tablet for Erectile Dysfunction, as this can delay the rate and time of the drug's onset. Official warnings note that the use of alcohol may contribute to the drug’s blood pressure-lowering effects, which can increase the risk of symptoms like dizziness.


Q: How often is Sildenafil Rodinal permitted to be taken, according to official guidelines?

The maximum recommended frequency for taking the drug for Erectile Dysfunction (ED) is once per day. For treating Pulmonary Arterial Hypertension (PAH), the drug is typically taken on a scheduled regimen, usually three times a day (TID). These frequency limitations are outlined in the official prescribing documents.


Q: Can Sildenafil Rodinal be used by people with diabetes?

Clinical trials for Erectile Dysfunction included men whose condition was secondary to various medical causes. Studies have specifically evaluated patients with Erectile Dysfunction linked to diabetes mellitus.


Q: Is Sildenafil Rodinal safe for older men (e.g., over 65)?

Official information specifies that older adults (over 65) may have reduced clearance of the drug due to potential age-related organ function decline. For this reason, caution is specified for this patient group, and regulatory labeling recommends considering a lower starting dose.


Q: What types of heart conditions make Sildenafil Rodinal unsafe to use?

Use is strictly contraindicated for patients who are concurrently taking any form of organic nitrates or the guanylate cyclase stimulator riociguat. Use is also restricted in patients with severe resting hypotension (low blood pressure) or those with a recent history of a stroke or myocardial infarction (heart attack).


Q: Does the food you eat change how well Sildenafil Rodinal works?

Yes, regulatory documents indicate that if you take Sildenafil Rodinal with a high-fat meal, the rate at which the drug is absorbed into your bloodstream is slowed down. This can delay the rate of absorption, which may prolong the time until the medication starts to work.


Q: Are there any long-term effects of taking Sildenafil Rodinal regularly?

Official research primarily focused on short-term symptom patterns, meaning that comprehensive data regarding the very long-term effects of continuous, extended use are not fully established. Follow-up durations were limited in the primary trials.


Q: Does Sildenafil Rodinal interact with alcohol?

Official regulatory warnings note that alcohol can contribute to the drug's blood pressure-lowering effects. This combination may increase the risk of symptoms like dizziness and lightheadedness. Patients should limit alcohol use and exercise caution when changing position (sitting or standing).


Q: Is Sildenafil Rodinal effective for men who have had prostate surgery?

Clinical trials for Erectile Dysfunction included men whose condition was secondary to various underlying medical causes. This research population included men with ED following certain types of prostate surgery, although the medication is not specifically indicated for this condition alone.


Q: Can Sildenafil Rodinal be used for pulmonary hypertension?

Yes, Sildenafil Rodinal is officially indicated for the treatment of Pulmonary Arterial Hypertension (PAH) in both adults and specific pediatric populations.


Q: What are the major warning signs to watch out for after taking Sildenafil Rodinal?

Regulatory documents advise seeking immediate medical attention if certain critical safety warnings occur. These include an erection lasting four hours or longer (Priapism), sudden loss of vision in one or both eyes, or sudden decrease or loss of hearing.


Q: Can Sildenafil Rodinal interact with supplements like L-arginine?

Sildenafil is metabolized primarily by the liver enzyme CYP3A4. Official warnings state that interactions may occur with any substance that inhibits or induces this enzyme, which can include certain supplements, as it may change the amount of drug in the bloodstream.


Q: Is Sildenafil Rodinal a treatment or a temporary fix?

Sildenafil Rodinal works by selectively inhibiting the PDE5 enzyme, which is a temporary action dependent on the drug being present in the system. It is considered a management or treatment option that facilitates a physical response, but the drug is not known to address or resolve the underlying cause of the conditions it is used for.


Q: Is there a maximum number of times you should take Sildenafil Rodinal per week?

The maximum recommended frequency for taking the drug for Erectile Dysfunction (ED) is defined as once per day. For Pulmonary Arterial Hypertension (PAH), the maximum is a scheduled dose of three times a day on a continuous basis.


Q: Does Sildenafil Rodinal affect fertility or sperm quality?

Official studies conducted in healthy male volunteers showed no measurable effect on sperm motility or morphology (the shape and movement of sperm) after single oral doses of sildenafil. This conclusion is based on data from official studies involving healthy male volunteers.


Q: Can women take Sildenafil Rodinal for any reason?

Sildenafil Rodinal is officially indicated for the treatment of Pulmonary Arterial Hypertension (PAH), which is a condition that affects both men and women. The drug is not indicated for the treatment of sexual dysfunction in women.


Q: Is it possible to develop a tolerance to Sildenafil Rodinal over time?

The primary clinical studies that led to the drug's approval were not specifically designed to assess or demonstrate the development of tolerance over extended periods of continuous use. Therefore, the official product information does not provide a definitive answer on this topic.


Q: How does Sildenafil Rodinal affect the body's natural processes?

Sildenafil is a selective PDE5 inhibitor. It works by blocking the PDE5 enzyme, which enhances the body's natural signaling of Nitric Oxide. This action ultimately leads to blood vessel relaxation and increased blood flow in specific tissues, facilitating the desired physical response.


Q: Does Sildenafil Rodinal have any known drug-drug interactions with antidepressants?

Sildenafil is broken down in the liver primarily by the enzyme CYP3A4. Interactions may occur with other medications that inhibit or induce this enzyme, which can include certain antidepressants, potentially leading to changes in the amount of Sildenafil in the bloodstream.


Q: Can Sildenafil Rodinal cause stomach upset or indigestion?

Official regulatory documents list Dyspepsia, which is the clinical term for indigestion, as a common adverse reaction reported in clinical trials. Dyspepsia is classified as a common adverse reaction in official documents.


Q: What are the general contraindications for Sildenafil Rodinal use?

The use of Sildenafil Rodinal is strictly prohibited (contraindicated) for patients who are concurrently taking any form of organic nitrates or the guanylate cyclase stimulator riociguat. It is also contraindicated in case of known hypersensitivity (allergy) to the drug.


Q: Can Sildenafil Rodinal cause nasal congestion?

Yes, official prescribing information lists nasal congestion (or rhinitis) as a common adverse reaction reported by participants in clinical trials.


Q: Is there information regarding strenuous exercise after taking Sildenafil Rodinal?

While the drug is indicated for improving exercise ability in patients with Pulmonary Arterial Hypertension (PAH), the safety of engaging in very heavy or strenuous exercise is not specifically detailed for all patient populations in the official product information.


Q: What are the public safety announcements regarding Sildenafil Rodinal?

Public safety information from regulatory authorities emphasizes the need to be aware of rare but serious adverse events. These include an erection lasting four hours or longer (Priapism), sudden loss of vision (NAION), and sudden hearing loss.

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How should Sildenafil Rodinal be stored and disposed of?

Sildenafil Storage and Disposal Instructions

Sildenafil tablets must be stored at Controlled Room Temperature, specifically between 20°C and 25°C (68°F and 77°F). Temperatures may temporarily range from 15°C to 30°C (59°F to 86°F).

The medication must be kept in its original container, and the container must be tightly closed to protect it from moisture. A mandatory regulatory requirement is to store the medicine out of the reach of children.

For sildenafil powder used to prepare an oral suspension, the liquid formulation has a stability limit and must be used within 60 days of reconstitution.

Sildenafil is not on the FDA's list of medicines recommended for disposal by flushing. Unused or expired product should be discarded through a community drug take-back program. Alternatively, the medicine may be mixed with an unappealing substance, sealed in a container, and placed in the household trash. All personal information should be removed from the container label before disposal.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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