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Important: This page provides general information about Cialis (tadalafil) for readers in Australia. It is not a substitute for medical advice from a doctor or pharmacist.

Cialis may require a prescription depending on local rules. Always speak with a healthcare professional before using this medicine.

What is Cialis?

Cialis is the brand name for tadalafil, a medicine used to treat erectile dysfunction (difficulty achieving or maintaining an erection) and, for some men, the symptoms of benign prostatic hyperplasia (an enlarged prostate). It is intended for adults and is not a treatment for women or children.

In Australia, whether a prescription is required may depend on local regulations. Cialis belongs to a class of medicines called PDE5 inhibitors, which help to increase blood flow to the penis during sexual stimulation. This action supports an erection when sexual arousal is present.

A Cialis tablet is taken by mouth with water. It is not an aphrodisiac and it does not cause an erection without sexual arousal. The medicine works best when you are sexually excited, and it does not provide protection from sexually transmitted infections.

If you have a medical condition or take other medicines, your doctor or pharmacist will assess whether Cialis is appropriate for you. They will review potential interactions and safety concerns before you start treatment.

What is Cialis used for?

The primary use of Cialis is to treat erectile dysfunction in men. It can help some people achieve and maintain an erection suitable for sexual activity when it is safe to do so.

Cialis is also used to improve urinary symptoms due to an enlarged prostate in some men. This can include a weaker urine stream, difficulty starting urination, or a feeling of incomplete emptying. Not everyone with prostate symptoms will be eligible for treatment with Cialis.

It is essential that Cialis is prescribed by a clinician who has reviewed your medical history. It is not intended to be used as a general sexual enhancer in people without erectile or urinary symptoms.

People with certain health conditions or who are taking specific medicines may not be able to use Cialis. A clinician will assess your suitability and discuss alternatives if needed before you start treatment.

How Cialis works

Cialis works by blocking an enzyme called phosphodiesterase type 5 (PDE5). PDE5 can reduce blood flow to the penis in some people. By inhibiting this enzyme, tadalafil helps to relax the smooth muscles in the penile blood vessels during sexual stimulation, allowing more blood to flow into the erectile tissue.

The effectiveness of Cialis relies on sexual arousal. It does not produce an automatic erection and it does not cure erectile dysfunction. The medicine helps support the natural process that leads to an erection when arousal is present.

The effect of Cialis can last for a variable period. In many people, the medicine remains active for a substantial time after taking it, which is why some people notice effects within a short time and others over a longer interval. The duration and reliability of the effect can vary from person to person.

Cialis does not change your testosterone levels or sexual desire. It is a targeted treatment for erectile dysfunction and/or urinary symptoms related to an enlarged prostate, under medical supervision.

How to use Cialis

Take Cialis exactly as your doctor or pharmacist tells you. Do not change the amount or frequency without professional advice. If you are unsure about the correct use, ask your pharmacist for guidance before taking the medicine.

Swallow the tablet whole with a glass of water. Do not chew, crush, or break the tablet unless your healthcare professional has told you to do so. The tablet should be taken as directed, either before anticipated sexual activity or as a daily regimen, depending on your prescription.

Timing with food can influence some people’s experience, so follow the advice given by your clinician. Do not take more than one Cialis tablet at a time unless explicitly advised by a healthcare professional. If you miss a scheduled dose when using a daily regimen, contact your clinician for instructions rather than doubling up.

Avoid taking Cialis with nitrates (medicines used for chest pain) or with certain heart or blood pressure medicines unless specifically advised by your doctor. Alcohol can also affect blood pressure and how you feel during sexual activity, so discuss alcohol use with your clinician while on Cialis.

Tell your clinician about all medicines you take, including over-the-counter products and supplements. Your clinician may adjust the dose or choose an alternative treatment to reduce the risk of interactions. If you have kidney or liver problems, your doctor may tailor the plan to you.

Who should avoid Cialis

Cialis is not suitable for everyone. People with certain medical conditions or who are taking specific medicines should avoid this treatment unless advised otherwise by a clinician. If you have any of the following conditions, discuss them with your doctor before starting Cialis:

Severe cardiovascular disease or a recent heart attack, stroke, or life-threatening heart rhythm problems. In these situations, the risks of sexual activity and medication may outweigh potential benefits.

Severe low blood pressure or a history of fainting with changes in blood pressure. Cialis can interact with medicines that lower blood pressure and may cause dizziness or fainting.

Use of nitrates or nitric oxide donors for chest pain. This combination can cause a dangerous drop in blood pressure. Do not take Cialis if you are using these medicines unless advised by a clinician.

Warnings and precautions

Before starting Cialis, tell your clinician about all medicines you take, including herbal products and vitamins. Some medicines can interact with Cialis and cause unexpected side effects or reduce effectiveness.

If you have a history of vision or eye problems, discuss this with your clinician. In rare cases, PDE5 inhibitors have been associated with sudden vision loss. Seek medical attention promptly if you notice any changes in vision.

If you experience sudden hearing loss, dizziness, or chest pain while taking Cialis, seek urgent medical help. Do not continue treatment without medical advice. The medicine may not be safe for you in these circumstances.

Certain medical conditions, such as severe liver or kidney disease or very low blood pressure, may require adjustments to the treatment plan or avoidance of Cialis. Your clinician will perform a full safety assessment before prescribing it.

Side effects

Like all medicines, Cialis can cause side effects in some people. Many people tolerate the medicine well, and side effects are often mild and short-lived. If you notice anything unusual, talk to your clinician or pharmacist for advice.

• Headache
• Indigestion or upset stomach
• Back pain
• Muscle aches or aches in the limbs
• Flushing (a warm or red feeling in the face, neck, or chest)

Most side effects diminish after a short period of time as your body adjusts. If any side effects persist or worsen, contact a healthcare professional. Seek urgent medical help if you experience an erection lasting longer than four hours, severe dizziness, sudden changes in vision or hearing, or signs of an allergic reaction such as swelling of the face or throat, severe rash, or trouble breathing.

Always report any side effects to your doctor or pharmacist, especially if you have an underlying health condition or you are taking other medicines. They can determine whether Cialis is still appropriate for you or if a different treatment is better.

In rare cases, Cialis may cause more serious adverse effects. Your clinician will explain the signs to watch for and what to do if they occur. Do not ignore symptoms or delay seeking care.

Drug interactions

Cialis can interact with several other medicines. Interaction risks can include dangerous drops in blood pressure, reduced effectiveness of other drugs, or increased side effects. Always tell your doctor about all medicines you take, including non-prescription drugs and supplements.

• Nitrates: medicines used to treat chest pain or heart conditions. Do not use Cialis if you are taking nitrates unless your clinician advises otherwise.
• Alpha-blockers: medicines for high blood pressure or prostate symptoms. They may lower blood pressure and can cause dizziness; a clinician may adjust the plan accordingly.
• Other erectile dysfunction medicines: taking Cialis with other ED treatments can increase the risk of adverse effects.
• Certain antibiotics and antifungal medicines, and HIV protease inhibitors: these can alter tadalafil levels in the blood. Inform your clinician about all medicines you take.
• Grapefruit or grapefruit juice: may affect tadalafil levels in the blood for some people. Discuss dietary restrictions with your clinician.

If you start or stop any other medicines, check with your clinician before continuing Cialis. Do not make changes to prescribed therapy without professional advice. Your clinician may adjust dosing or switch to a different treatment to maintain safety and effectiveness.

Pregnancy and breastfeeding

Cialis is not intended for use by women, pregnancy, or breastfeeding. The safety and effectiveness of tadalafil in pregnancy have not been established. If you are pregnant or planning to become pregnant, discuss options and safety with your healthcare professional.

Breastfeeding while using Cialis has not been well studied. If you are breastfeeding or planning to breastfeed, talk to your clinician about the best approach and whether alternative treatments may be more appropriate for you.

If a partner is pregnant or could become pregnant, you should discuss any potential exposure to tadalafil or other medicines with your healthcare professional. They can provide guidance on safety and timing of treatment for both partners.

As with all medicines, do not share Cialis with others or use someone else’s medication. Only use Cialis as prescribed by a clinician who has reviewed your personal health history.

Frequently asked questions

Below are common questions people ask about Cialis. If you have further questions or concerns, speak with a doctor or pharmacist for personalised advice. This information is not a substitute for professional medical guidance.

How soon can I expect Cialis to work?

Many people notice an effect within a short time after taking Cialis, but the exact timing can vary. The presence of sexual arousal and individual factors such as age, health, and other medications can influence how quickly you notice the medicine working.

How long does the effect last?

The medicine can remain active in the body for a considerable period, and the duration can differ between individuals. It does not guarantee a successful erection every time, and the timing may be affected by factors such as food and alcohol intake, health status, and sexual stimulation.

Can I drink alcohol while taking Cialis?

Moderate or high alcohol intake can affect blood pressure and may increase some side effects. Discuss your drinking habits with your clinician, especially if you plan to use Cialis regularly.

What should I do if I miss a dose?

If you are using Cialis on a non-daily as-needed basis, a missed dose does not usually require special action other than continuing with your next scheduled dose as prescribed. If you are using Cialis daily, follow your clinician’s instructions for missed doses or talk to them before resuming therapy.

Can I take Cialis with other treatments for erectile dysfunction?

Using Cialis with other erectile dysfunction medicines is generally not recommended unless advised by a clinician. Combining ED treatments can increase the risk of side effects and complications. Always check with your healthcare professional before combining therapies.

When should I contact a doctor?

Seek medical advice if you experience an erection lasting longer than four hours, sudden vision or hearing changes, chest pain, or severe dizziness. Also contact your clinician if you have persistent or worsening side effects or if Cialis does not seem to be helping after a reasonable period of use.

Is Cialis safe for people with heart disease?

People with certain heart conditions can be at higher risk when using Cialis, especially in combination with certain medicines. Do not start Cialis without medical evaluation if you have a serious heart condition or if you are taking nitrate medications. Your clinician will determine the safety of Cialis for you based on your health status.

Can Cialis be used during pregnancy or for fertility planning?

Cialis is not intended for use by people who are pregnant or trying to conceive. If pregnancy or conception is a possibility, discuss risks and alternatives with a healthcare professional. The information here is not a replacement for professional guidance.

How should I store Cialis?

Store Cialis tablets at room temperature, away from moisture and heat. Keep them in their original packaging and out of reach of children. Do not use Cialis after its expiry date, and do not use damaged tablets.

What if Cialis does not seem to work for me?

If Cialis does not produce the desired effect or if you find it no longer works as well as before, do not adjust the dose yourself. Contact your clinician for a review. They may adjust the treatment plan or discuss alternative therapies that are appropriate for your situation.

Sources

The information provided here is based on general patient guidance and typical product information for tadalafil-based medicines. For specific, up-to-date details, always refer to the official patient information leaflet and speak with a healthcare professional.

• Manufacturer’s patient information for Cialis (tadalafil) and related product labels
• Australian Medicines Handbook and pharmacy reference materials
• Regulatory and safety summaries issued by the Australian regulatory framework (where available in patient-facing formats)
• Consultation with healthcare professionals for individual medical advice and dosing decisions