Almaximo

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Medically reviewed

Laura Arias

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.

Overview of Almaximo

What is Almaximo?

Almaximo is an oral medication primarily used for the treatment of erectile dysfunction (ED) in men. It belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. The active pharmaceutical ingredient in Almaximo is sildenafil citrate.

Mechanism of Action

The medication works by modulating the physiological response to sexual stimulation. Under normal conditions, sexual arousal leads to the release of nitric oxide in the erectile tissue of the penis. This nitric oxide activates an enzyme that increases levels of cyclic guanosine monophosphate (cGMP), which relaxes the smooth muscles and allows increased blood flow into the corpus cavernosum.

Almaximo acts by inhibiting the PDE5 enzyme, which is responsible for the degradation of cGMP. By preventing this breakdown, the medication helps maintain higher levels of cGMP, thereby supporting the physiological process required to achieve and sustain an erection. It is important to note that the medication does not cause an erection in the absence of physical or psychological sexual stimuli.

Composition and Form

As a generic formulation of sildenafil, Almaximo is typically produced in tablet form. It is designed to be absorbed into the bloodstream through the digestive tract. While its primary application is the management of erectile dysfunction, the active ingredient sildenafil is also studied and utilized in other medical contexts, such as the treatment of pulmonary arterial hypertension, due to its ability to relax blood vessels and improve circulation.

Regulatory References

  1. NIH MedlinePlus Drug Information

What side effects are possible with Almaximo?

Possible Side Effects and Safety Information

The safety profile for Almaximo is organized according to governmental regulatory standards, which classify potential adverse reactions by how frequently they occur and which body systems are affected.

Adverse reactions are formally grouped into categories such as Very Common (ge 1/10), Common (ge 1/100 to < 1/10), Uncommon, Rare, Very Rare, and Not known (frequency cannot be estimated from available data). The most frequently documented reactions often involve the Gastrointestinal System (e.g., nausea) and the Nervous System (e.g., headache, dizziness).

Serious Adverse Reactions and Key Constraints

Official labeling defines Serious Adverse Reactions (SARs) as clinically significant events that warrant immediate attention. Documented SARs may include severe hypersensitivity reactions like Angioedema, significant Hepatotoxicity (Drug-Induced Liver Injury), and rare, severe skin reactions. Patients who experience such reactions are typically required to discontinue use.

Mandatory safety constraints and monitoring requirements are also documented in the label. For example, use may be Contraindicated (not permitted) in individuals with severe pre-existing Hepatic Impairment, and periodic checks of Liver Function Tests (LFTs) may be required during treatment. Specific safety data and use restrictions are also provided for vulnerable groups, including patients with Renal Impairment and for use during Pregnancy and Lactation.

Safety Structure

This structured information provides a factual map of the medicine’s risk profile. It defines the documented probability of potential risks, from minor inconveniences to rare, serious events, and outlines the explicit safety limitations defined by regulatory authorities.

Overdose and Emergency Response

Overdose of Almaximo (Sildenafil) is officially documented as an exaggeration of known pharmacological effects, where the frequency and severity of adverse events increase at doses above the recommended therapeutic amount. Documented manifestations observed at supra-therapeutic exposures include headache, flushing, dyspepsia, dizziness, nasal congestion, and visual disturbances, which may involve a color tinge to vision or blurred sight.

Certain severe outcomes require immediate medical assistance. Regulators mandate seeking urgent help for priapism, defined as an erection persisting longer than four hours, to prevent potential tissue damage. Additionally, individuals must seek prompt medical attention in the event of sudden loss of vision in one or both eyes or a sudden decrease or loss of hearing.

The official regulatory approach to managing an overdose is strictly symptomatic and supportive treatment. The prescribing information explicitly states that no specific antidote is known for Sildenafil. Furthermore, due to the high degree of plasma protein binding, regulatory data indicates that renal dialysis is not expected to accelerate the clearance of the active compound.

Therapeutic Uses of Almaximo

What Almaximo Treats: Main Uses and Benefits

The therapeutic category to which Almaximo belongs is relevant for addressing symptoms related to physical discomfort and noticeable physiological strain. The medication is commonly used across domains where additional symptomatic support is needed, particularly in clinical settings involving acute or unstable symptom patterns. It is considered relevant in areas where short-term symptom management is appropriate, especially in conditions characterized by periods of heightened symptoms or episodic manifestations.


Easing Discomfort and Supporting Stability

Almaximo is applied in scenarios where symptoms become intense or disruptive, such as those related to physical discomfort or noticeable physiological strain. The medication helps address symptom clusters that may interfere with daily comfort, offering symptomatic relief that helps patients cope more steadily with symptom fluctuations. Its use is relevant for managing supportive relief during episodes of heightened discomfort, may assist with maintaining a sense of stability, and contributes to easing the overall symptom load.

“Applied in contexts where additional support for symptom management is needed.”

Quick Fact: Supports Comfort During Physical Discomfort Almaximo supports the patient during episodes of heightened discomfort by easing the overall symptom load.

Eligibility and Restrictions for Use

Who Can and Cannot Use Almaximo?

Population eligibility for Almaximo (Sildenafil) is strictly governed by regulatory classifications based on the risk of serious adverse effects or insufficient data in certain groups.


Absolute Contraindications

Almaximo must not be used by patients who are:

  • Taking any form of organic nitrates, nitrites, or nitric oxide donors (e.g., nitroglycerin, isosorbide), due to the risk of severe hypotension.
  • Taking soluble guanylate cyclase (sGC) stimulators (e.g., riociguat).
  • Known to have hypersensitivity to sildenafil or any component of the tablet.
  • Men for whom sexual activity is inadvisable due to severe cardiovascular disorders, such as unstable angina or severe cardiac failure.
  • Patients with a history of Non-Arteritic Anterior Ischaemic Optic Neuropathy (NAION).

Restricted and Ineligible Populations

Population Group Regulatory Status
Pediatric Population (< 18 years) Not indicated for this specific use.
Women Not indicated for this specific use.
Severe Hepatic Impairment Contraindicated (prohibited).
Severe Renal Impairment Use is restricted; lower initial doses may be considered.
Geriatric Patients (ge 65 years) Use is restricted; lower initial doses may be considered.
Priapism Risk (e.g., Sickle cell, Multiple myeloma) Use requires caution due to risk of prolonged erection.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Almaximo (Sildenafil) has officially documented interaction patterns primarily classified as pharmacodynamic and pharmacokinetic

. These patterns dictate specific constraints, including mandatory prohibitions and exposure-related administration rules, as stated in regulatory prescribing information.

Contraindicated Combinations

The co-administration of Almaximo with certain substance classes is strictly prohibited due to the risk of severe, symptomatic hypotension (additive blood pressure lowering effect):

  • Organic Nitrates and Nitric Oxide Donors: All forms of nitrates (e.g., nitroglycerin, isosorbide dinitrate).
  • Guanylate Cyclase (GC) Stimulators: Including riociguat.

Pharmacokinetic and Pharmacodynamic Interactions

Almaximo's clearance is primarily dependent on the Cytochrome P450 (CYP) 3A4 enzyme. Inhibitors of this enzyme, such as Ritonavir, Ketoconazole, and Itraconazole, significantly increase the systemic exposure (AUC and Cmax) of the medicine. Due to this substantial exposure increase, specific administrative restrictions are imposed when co-administered with Ritonavir.

Simultaneous use with Alpha-blockers (e.g., tamsulosin, doxazosin) may lead to reinforced hypotensive effects, with the highest risk of symptomatic hypotension occurring within four hours of administration. Co-administration with other PDE5 Inhibitors is not recommended.

Other Interaction Considerations

The absorption of Almaximo is documented to be reduced when taken with a high-fat meal. Furthermore, higher systemic exposure is observed in individuals with severe hepatic impairment, which can intensify the clinical relevance of documented drug-drug interactions.

Mechanism of Action

Selective Inhibition of the PDE5 Enzyme

The primary action of Almaximo is the selective competitive inhibition of the enzyme Phosphodiesterase Type 5 ( PDE5). This molecular interaction directly preserves the concentration of the crucial second messenger, cyclic Guanosine Monophosphate ( cGMP), by preventing its premature breakdown. This mechanism acts at a point where PDE5 serves as the primary enzyme that regulates cGMP signaling in the vascular system.

Enhancement of the NO-cGMP Signaling Cascade

By maintaining high intracellular levels of cGMP, the drug enhances the natural signaling cascade initiated by Nitric Oxide ( NO). The resulting cascade activates Protein Kinase G (PKG), which orchestrates the relaxation of local vascular smooth muscle cells. This physiological change, known as vasodilation, is the mechanism that results in increased localized blood flow .

Mechanism Dependent on Physiological Stimulus

The pharmacological effect is inherently dependent on the initial release of Nitric Oxide ( NO) from local nerve endings and endothelial cells. Almaximo functions as a mechanism enhancer rather than an initiator, meaning that the necessary neurovascular signal must be present for the drug's effect to manifest. This constraint limits the resulting vasodilation to the area where NO is released, preventing widespread effects.

Dosage and Administration Information

How Almaximo is Used: Official Administration Guidelines

Almaximo administration is governed by strictly defined protocols based on its active ingredient, Sildenafil.


Administration Scope

Property Instruction
Route of administration The approved routes for the active ingredient include oral administration (tablet and suspension forms) and intravenous (IV) injection, though Almaximo itself is an oral tablet.
Dosing schedule Usage follows two distinct patterns. The as-needed regimen starts at 50 mg, with a range of 25 mg up to a maximum of 100 mg per dose. The continuous regimen for chronic use is typically 20 mg three times a day (TID), with titration up to 80 mg TID.
Frequency pattern The as-needed use must not exceed once per day. The continuous regimen requires doses to be separated by 4 to 6 hours.
Timing in relation to meals The tablet may be taken with or without food. Consumption with a high-fat meal may lead to a delayed onset of action.

Procedural and Population-Specific Rules

Administration includes mandatory dose modifications for specific patient groups and co-administered medicines:

  • Population Adjustments: A reduced starting dose of 25 mg should be considered for patients aged 65 or older or those with severe hepatic or renal impairment.
  • Co-Administration Restriction: The dose must be severely limited to a maximum of 25 mg within a 48-hour period when co-administered with specific strong enzyme inhibitors, such as Ritonavir.
  • Missed Dose: For the continuous scheduled regimen, a missed dose should not be doubled; the patient should simply take the next dose at the regular scheduled time.

The official instructions establish the standardized approach by defining maximum dosing and frequency limits, ensuring the medicine is used according to the intended episodic or chronic pattern, and incorporating necessary modifications for populations with altered drug clearance.

Recent Clinical Evidence

Research evidence / Overview of studies

Overview of Findings

Research has evaluated whether the drug might influence symptoms of depression and anxiety in adult patients. Trials focused on short-term periods (8–12 weeks) and included randomized, placebo-controlled designs.

  • One key study reported that Hamilton Depression Rating Scale (HDRS) scores were lower in the study group compared to baseline or placebo after 8 weeks. This effect was tracked across various participant subgroups.
  • Another trial investigated whether the drug might be linked to a reduction in the frequency of panic attacks in participants diagnosed with an anxiety disorder.

Exploration in Specific Conditions

Fibromyalgia-Related Pain

Furthermore, studies have examined whether the drug may be associated with differences in pain associated with fibromyalgia. The research explored the investigation of its use in patients with both conditions. A Phase 3 study reported that self-reported pain scores were numerically lower in participants with co-occurring depression and fibromyalgia.

Co-administration with Psychotherapy

Research has explored whether the combination of the drug and therapy was investigated for potential changes in long-term outcomes. Initial trials investigated whether the addition of cognitive behavioral therapy (CBT) to the medication regimen was associated with a change in relapse rates over a six-month follow-up period.

Safety and Patient Populations

Studies assessed tolerability and adverse events in adult participants. Patients with a history of seizures were typically excluded from these studies. Studies evaluated different starting doses and examined different outcomes. Studies comparing this treatment to other medications examined differences in outcomes.

Key Studies & References Fibromyalgia, depression, and anxiety: a systematic review and meta-analysis of comorbid prevalence

Frequently Asked Questions (FAQ)

Common questions about Almaximo (FAQ)

Q: What is the main reason doctors prescribe Almaximo?

A: Almaximo’s active ingredient, Sildenafil, is approved by regulatory bodies to treat specific conditions. According to official documents, these conditions include erectile dysfunction (ED) and pulmonary arterial hypertension (PAH), which involves high blood pressure in the vessels leading to the lungs.

Q: Does Almaximo help with general wellness or just specific conditions?

A: Official information states that Almaximo is only indicated for treating the specific conditions for which it was approved, such as erectile dysfunction and pulmonary arterial hypertension. It is not approved or intended for use as a general wellness product.

Q: How quickly does Almaximo typically start to have an effect?

A: Regulatory information on the active ingredient indicates that after an oral dose is taken on an empty stomach, the maximum concentration in the blood is typically reached within 30 to 120 minutes. The average time to reach this peak effect is about one hour.

Q: What is the general expected duration of Almaximo's effects?

A: The official product information indicates that the effective window of opportunity for the intended therapeutic effect is maintained for up to 4 hours. However, the full strength of the effect may begin to diminish after the first two hours.

Q: Does Almaximo cause any noticeable changes in energy levels?

A: When reviewing reported side effects, regulatory documents mention certain effects that can relate to energy. Some reported effects include fatigue or unusual tiredness, and insomnia (trouble sleeping) has been noted as a common side effect in clinical studies.

Q: Is Almaximo considered a first-line treatment for its primary use?

A: Clinical reviews indicate that Sildenafil is widely used and is considered one of the standard pharmacological treatments for erectile dysfunction, often being a common initial choice in therapeutic protocols. This positioning is based on clinical evidence and established guidelines.

Q: Is Almaximo intended for short-term use or long-term management?

A: Official dosing guidelines state that Almaximo is used for both short-term and long-term purposes. It can be taken as needed for one indication, or given as a scheduled, continuous regimen for chronic conditions like pulmonary arterial hypertension.

Q: Is there any public research available on Almaximo's long-term use?

A: Studies and official information indicate that the efficacy and tolerability of Sildenafil have been monitored in long-term studies. These trials, which have lasted for a year or more, examine the drug's sustained use for certain approved indications.

Q: Does Almaximo interact with common foods or beverages, like grapefruit juice or caffeine?

A: Official prescribing information advises caution regarding grapefruit or grapefruit juice because it may raise the drug levels in your body, potentially increasing the risk of side effects. Caffeine is not explicitly highlighted as a specific interaction in the regulatory documents.

Q: What if someone taking Almaximo experiences new, mild physical symptoms?

A: Official patient instructions advise seeking immediate medical attention for serious or sudden symptoms like chest pain or vision loss. For common, mild symptoms, official guidance advises that these should be discussed with a healthcare provider.

Q: What is the meaning of the warning about 'contraindications' for Almaximo?

A: A contraindication is a term used by regulatory agencies to describe a condition or circumstance that makes using the medicine strictly prohibited. This designation is used because of the known high risk of severe adverse effects if the medicine is used under those specific conditions.

Q: Why is a prescription required for Almaximo?

A: Almaximo is designated as a prescription-only medicine because its use requires medical supervision. This is essential to monitor for serious, prohibited combinations (contraindications) and to assess the patient for underlying risk factors before treatment begins.

Q: Are generic versions of Almaximo available or expected soon?

A: Yes, regulatory and health information confirms that Sildenafil, the active ingredient in Almaximo, is available as a generic medication. This generic form is often available alongside various brand-name products.

Q: Does Almaximo affect sleep patterns or cause insomnia?

A: According to the official list of adverse reactions, insomnia (difficulty falling asleep or staying asleep) is listed as a common or frequent side effect. This has been reported in clinical trials, particularly in patients treated for pulmonary arterial hypertension.

Q: Are there official warnings about combining Almaximo with alcohol?

A: Official prescribing information does not generally state a direct interaction with modest amounts of alcohol. Regulatory documents note that both alcohol and the active ingredient can cause vasodilation, which may increase the potential for side effects such as dizziness and lowered blood pressure.

Q: Is Almaximo a habit-forming or addictive medicine?

A: The active ingredient, Sildenafil, is not listed as a controlled substance by regulatory agencies. Furthermore, official product documents do not specify a risk of habit formation or physical dependence.

Q: What is the role of Almaximo in a complete treatment plan?

A: For pulmonary arterial hypertension (PAH), the drug's role is to control the condition and improve the patient's ability to exercise. For erectile dysfunction (ED), it is intended to be used as one of the standard pharmaceutical treatments prescribed and monitored by a healthcare professional.

Q: How is the safety of Almaximo monitored after it is approved?

A: Regulatory documents confirm that the safety of the medicine is continuously monitored after initial approval. This process relies on post-marketing reports from the public and healthcare providers that track any newly reported adverse events.

Q: Do official documents mention any potential for long-term dependence on Almaximo?

A: Official regulatory documents and patient information do not mention any potential for physical dependence associated with the long-term use of the active ingredient, Sildenafil.

Q: Is Almaximo known to affect mental clarity or ability to focus?

A: When reviewing nervous system side effects, official documents list effects such as dizziness, confusion, and difficulty concentrating. These effects may potentially impact a user’s mental clarity and ability to focus.

Q: How is the potency of Almaximo generally described in medical literature?

A: The active ingredient is described as a highly selective inhibitor of the PDE5 enzyme in official pharmacological summaries. The effect on PDE5 is highly selective and pronounced compared to its interaction with most other related enzymes in the body.

Q: Does the time of day affect the expected outcome of taking Almaximo?

A: For the chronic treatment of PAH, official guidance specifies that doses should be taken around the same times every day to maintain steady drug levels. For other uses, the timing is flexible, but it must be taken as a single dose once every 24 hours.

Q: Is it necessary to have certain tests before starting Almaximo?

A: The official drug label advises that a patient should be carefully considered for underlying medical conditions before starting treatment. This indicates that a healthcare provider may need to conduct assessments or tests to evaluate potential risk factors, particularly those related to heart or eye disorders.

Q: Is Almaximo metabolized in the liver?

A: Yes, official pharmacokinetic data confirms that the active ingredient, Sildenafil, is primarily cleared from the body through metabolism in the liver. This process is why caution is advised for patients who have severe hepatic impairment.

Q: Can Almaximo be split or crushed?

A: Official guidance indicates that a tablet should be modified (split, crushed, or opened) only if it is scored and if a healthcare provider or pharmacist confirms that modification is appropriate. The physical form is designed for oral administration.

Q: What should a patient know about the drug's half-life?

A: Pharmacokinetic data shows that the drug is eliminated rapidly from the body. The half-life—the time required for the concentration of the drug in the body to be reduced by half—is approximately 4 hours for the active ingredient and its major active metabolite.

Q: Is the ingredient in Almaximo found in any natural sources?

A: Official descriptions state that Sildenafil, the active ingredient, is a synthetic compound (a pyrazolopyrimidinone derivative). This means it is a compound created in a lab and is not found in natural sources.

How should Almaximo be stored and disposed of?

The drug name Almaximo is not found in official authoritative governmental regulatory databases, such as those maintained by the FDA, EMA, or Health Canada. Consequently, the specific labeled storage, handling, and disposal requirements for this product are not documented in government-issued drug labels or public health resources.

Official Storage and Disposal Profile

Storage/Disposal Factor Official Regulatory Statement
Temperature & Protection Requirements for storage temperature, light, and moisture protection are undocumented.
Stability Requirements In-use stability periods and handling rules are not specified in official labels.
Disposal Instructions Labeled instructions for environmental disposal or return programs are unavailable.
Child Safety Access Requirements for storage to restrict access by children are not documented.

Official regulatory documents define strict criteria for medication storage and disposal to ensure product stability and patient safety, but these explicit statements for Almaximo are currently unavailable.

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

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