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What is Viagra (sildenafil)?

Viagra (sildenafil) is used to treat erectile dysfunction. Erectile dysfunction is the inability to get or keep an erection for satisfactory sexual activity in men, also known as impotence. Sildenafil belongs to a class of medications called phosphodiesterase type5 (PDE5) inhibitors. Viagra works by relaxing muscles found in the walls of blood vessels and increasing blood flow to the penis during sexual stimulation to get and keep an erection. Keep in mind that Viagra does not cure erectile dysfunction or increase sexual desire.

under the brand Revatio is also used to treat pulmonary atrial hypertension (PAH). If you are taking Revatio do not take Viagra unless directed by your physician.

Buy Viagra Online : Know the Dosage

The recommended dose is 50mg about 1 hour before sexual activity, but it can be taken from 30 minutes to 4 hours before intercourse. The maximum daily dosage is once per day, with or without food. The dosage can be increased to 100mg or decreased to 25mg based on toleration and effectiveness. Viagra 100mg are available in KamaHealth.

Side Effects

MedicationOnsetDuration
Sildenafil (Viagra)30-60 minutes4-5 hours

The most common side effects consist of the following:

  • Headache, nausea, and dizziness
  • Stuffy nose, nosebleed
  • Temporary redness of neck and face
  • Backache, indigestion

If you are a heart patient, sexual activity could put extra strain on your heart. If you experience the following serious side effects while having sex, stop and get medical help right away. The side effects include:

  • Severe dizziness
  • Nausea
  • Chest/jaw/left arm pain
  • Fainting

Some patients may experience serious side effects; if you experience these, get medical help right away. Serious side effects include:

  • Temporary memory loss
  • Seizures
  • Serious allergic reaction, including rash, itching or swelling (especially of the face, tongue, or throat), severe dizziness, and trouble breathing.

We offer more than just lower prices on

sildenafil in Canada and free shipping. Some patients experience side effects that are not listed. If you have any concerns regarding Viagra, contact your physician.

Take note: This medicine is available only with a valid doctor's prescription.Unexpected side effects could occur if you give Viagra to a patient while having sex. These side effects are not experienced by everyone. And, if you do experience side effects while having sex, stop and get medical help right away. The most common side effects:
  • Headache, nausea, dizziness
  • Tiredness in the meantime
  • illy mood changes

We offer more than just lower prices on. When you stop taking Viagra, you may experience other side effects besides those described as side effects. The side effects we sell after a medical problem or medical condition start as soon as what you get as soon as you talk to your physician. However, the side effects we treat include:

  • Liver damage
  • Allergic rash

If you experience any severe symptoms and notice any symptoms not being taken by your doctor, get medical help right away.

  • Tiredness
  • Heart problems

When you stop taking Viagra, you may experience other side effects.

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How to use
  • Always take this medicine exactly as your pharmacist or doctor has told you.
  • The usual recommended dose is 50mg taken as needed, approximately one hour before sexual activity.
  • Swallow the tablet whole with a glass of water.
  • Viagra Connect 50mg can be taken with or without food. However, the medicine may take longer to start working if you take it with a heavy meal.
  • It is best not to drink high amounts of alcohol before taking Viagra Connect 50mg as it may limit its effectiveness.
  • You should not take more than one tablet in any 24-hour period, and only use it when sexual activity is anticipated.
  • Remember to talk to your pharmacist if you are unsure on how to take this medicine. Consult your doctor or a pharmacist immediately if you experience any serious side effects.
Main Ingredients
  • Sildenafil citrate, microcrystalline cellulose, calcium hydrogen phosphate (anhydrous), croscarmellose sodium, magnesium stearate, hypromellose, titanium dioxide (E171), lactose monohydrate, triacetin, indigo carmine aluminium lake (E132)
Side Effects & CautionsSide Effects:
  • Can cause headaches, dizziness, and blurred vision. Avoid activities like driving until you know how it affects you.
  • Can lead to upset stomach or nausea. Take the medication with food to prevent these effects.
  • May cause flushed skin or rash.
  • It can cause a drop in blood pressure, leading to feelings of lightheadedness.
  • It can trigger a serious skin reaction, symptoms include skin rashes, blisters, or peeling.
  • It can rarely cause prolonged, painful erections. Seek medical help immediately if this occurs.
  • If you have heart problems, using this drug may increase your risk of heart attack or stroke. Discuss the risks with your doctor.
  • Do not use if you are also taking nitrates or recreational drugs containing nitrates.
  • Avoid using with other medications for erectile dysfunction.
  • Do not drink excessive amounts of alcohol while using this drug.
  • Note: This list is not exhaustive. Always consult your doctor for complete information.
Cautions:
  • Do not take Viagra Connect if you are allergic to any of its ingredients.
  • It is not suitable for men under the age of 18 or women.
  • Avoid taking it if you have serious heart or liver problems or if you've recently had a stroke or heart attack.
  • Combining Viagra Connect with other medications containing nitrates can considerably lower the blood pressure.
  • Do not take Viagra Connect if you suffer from a rare inherited eye disease like retinitis pigmentosa.
  • Possible side effects include headaches, nausea, hot flushes and dizziness.
  • If an erection lasts for more than 4 hours, seek medical help immediately.
  • Consult your doctor if you have conditions like Peyronie’s disease or any other deformation of the penis.
  • Do not exceed the recommended dosage.
  • Taking Viagra Connect will not prevent pregnancy or the spread of sexually transmitted diseases.
Patient Information LeafletShare:

Last updated: 30 May 2025

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Sildenafil and tadalafil are both effective treatments for erectile dysfunction (ED). However, there are several differences between sildenafil and tadalafil. Understanding these differences is important for anyone taking sildenafil and tadalafil together.

The primary difference between sildenafil and tadalafil lies in their duration of action. Sildenafil usually lasts about 4-6 hours, while tadalafil usually lasts about 4-5 hours. This duration allows for flexibility in dosage, allowing for more natural erections when sexually stimulated.

This article will explore the length of sildenafil and tadalafil action, as well as their common side effects, such as headache, flushing, and dizziness. It will also explore the dosage and administration methods of both medications.

NewThe Success by Sildenafil and Tadalafil TabletsSildenafil and tadalafil (generic Viagra®) are both effective erectile dysfunction treatments. However, there are some differences between sildenafil and tadalafil.

Understanding the Length of Sildenafil and Tadalafil Action

The duration of action for sildenafil typically ranges from 4 to 6 hours. This period allows for natural erections when sexually stimulated.

Similarly, the duration of action for tadalafil typically ranges from 5 to 7 hours.

Factors Affecting the Duration of Sildenafil and Tadalafil Action

Blood pressure levels, for both sildenafil and tadalafil, are closely linked to the duration of action for these medications. These factors influence the effectiveness of sildenafil and tadalafil for ED.

  • Blood Pressure Levels:Blood pressure levels are often monitored to ensure optimal treatment effectiveness. Over time, blood pressure readings may become unreliable due to variations in the medication's effects.
  • Duration of Action:The length of these medications can affect the effectiveness of their effects. For example, sildenafil's duration of action typically ranges from 5 to 7 hours.
  • Dosage:The duration of these medications can also affect the dosage used. For example, tadalafil's duration of action can be longer, ranging from 5 to 7 hours.

It's important to note that these factors can also influence the effectiveness of sildenafil and tadalafil for ED. Factors such as the medication’s dosage and the duration of action of these medications can influence the effectiveness of sildenafil and tadalafil for ED.

The duration of sildenafil and tadalafil's effectiveness varies from person to person. For example, sildenafil's duration of action typically ranges from 4 to 6 hours. This duration allows for natural erections when sexually stimulated.

Similarly, the duration of action of sildenafil is influenced by various factors, such as the dosage used, the severity of ED, and the response to treatment. For example, sildenafil’s duration of action typically ranges from 5 to 7 hours.

The factors that determine the duration of sildenafil and tadalafil's effectiveness are different from person to person. For example, the duration of action for sildenafil typically ranges from 4 to 6 hours.

Another factor that can also affect the duration of sildenafil and tadalafil's effectiveness is their onset of action. Sildenafil typically begins to work within 30 to 60 minutes of ingestion. Tadalafil’s start of action typically begins to 1 hour after ingestion.

Viagra has been shown to cause some mild side effects. Talk to your health care provider if these do not go away within a few days. If you begin to experience more serious reactions, seek medical attention immediately.

Common side effects reported from Viagra use include:

  • Headache
  • Heartburn
  • Congestion
  • Nasal bleeding (bloody nose)
  • Nausea
  • Diarrhea
  • Muscle aches or pains
  • Flushing
  • Facial pain or tenderness
  • Vision changes
  • Light sensitivity

More severe side effects include:

  • Painful erections or erections that last longer than 4 hours
  • Sudden loss of vision
  • Sudden loss of hearing
  • Ringing in the ears
  • Chest pain
  • Shortness of breath
  • Painful urination
  • Increased urination frequency
  • Fainting
  • Dizziness
  • Skin rash
  • Hives
  • Facial swelling

If you experience any of these side effects, seek medical attention immediately. These are symptoms of a severe adverse reaction to this medication that require immediate treatment.

As with all prescription medications, inform your doctor of any medical conditions you currently manage. Tell them about any and all medications, prescription drugs, and supplements you are taking before starting treatment with Viagra. Viagra can interact with bodily substances, causing potentially serious adverse reactions.

Specifically, you should inform your health care provider of any nitrate medication you are taking. Remember to mention any herbal products you use, especially St. John’s wort.

In addition, let your doctor know if you have recently had heart surgery or experience chest pain during sex. If you experience any changes in your heartbeat or chest pain during sex, contact your health care provider immediately.

asthma is a medication used to treat pain and inflammation of the airways of the lungs ( airflow into the lungs). While Viagra is not an antibiotic, it is an antibiotic that can affect the heart rhythm (QT prolongation) and the rhythm ( cyanination) of the brain (conjunctivitis). QT prolongation can occur during Viagra use, causing sudden changes in the heart rate or heartbeat.Doxycycline can increase the risk of blood clots in the blood vessels that supply your lungs ( airflow into the lungs). While Viagra is not an antibiotic, it can affect the heart rhythm (QT prolongation) and the rhythm (conjunctivitis) of the brain (conjunctivitis).

If you experience any changes in your heart rate or heartbeat, notify your doctor. This is a rare side effect that may required immediate medical attention.

If you experience changes in your heart rate or heartbeat, notify your doctor. This is a rare side effect that may require immediate medical attention.

As with all prescription medications, inform your doctor of any medical conditions your doctor is unable to treat your health care provider has polycystic ovary syndrome (PCOS).

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  • Using Viagra can cause a blood thinner such as warfarin to impact the blood group side effects reported. Using Viagra with a blood thinner, such as cWarfarin, can cause a blood thinner to impact the blood group side effects reported.
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