Buy now, Pay Later now available withKlarnaandaffirm
A whole clinic, on your phone. At-home labs. Physician reviewed. Medications delivered. Always ships free.
Happy Labs/Shop/Sildenafil

Sildenafil

Generic Viagra. Sildenafil tablets, 50 mg or 100 mg, physician-selected based on need. A short-acting PDE5 inhibitor with a 4 to 6 hour window. Same active ingredient as Viagra at a fraction of the cost. Minimum 3-month prescription. Same price for both strengths. Shipped discreetly in plain packaging.

Physician-designed

Board-certified doctors · all necessary supplies included

01CLIA-certified labs·
02Board-certified physicians, all 50 states·
03FDA-approved 503A pharmacies·
04HSA / FSA eligible·
05HIPAA-locked, never sold·
01CLIA-certified labs·
02Board-certified physicians, all 50 states·
03FDA-approved 503A pharmacies·
04HSA / FSA eligible·
05HIPAA-locked, never sold·
01CLIA-certified labs·
02Board-certified physicians, all 50 states·
03FDA-approved 503A pharmacies·
04HSA / FSA eligible·
05HIPAA-locked, never sold·

Benefits

How Sildenafil can help

Sexual health touches confidence, connection, and quality of life. Physician-reviewed treatment can help you feel like yourself again.

  • 01

    The generic Viagra

    Sildenafil is the exact same active ingredient as brand-name Viagra. FDA-approved, decades of clinical data, at a fraction of the price. No brand markup, same medication.

  • 02

    Fast-acting when you need it

    Onset is typically 30 to 60 minutes, with a 4 to 6 hour window of activity. Best taken on a relatively empty stomach — heavy or high-fat meals can slow absorption.

  • 03

    Strength picked for you

    50 mg or 100 mg. Your physician chooses the strength based on your intake, history, and how your body responds. Same price either way — no upcharge for the higher dose.

  • 04

    Discreet delivery

    Plain packaging, shipped from a licensed 503A pharmacy, refills built in. Cancel anytime. Shipping is always free.

How Happy Labs works

A whole clinic, on your phone.

  1. Step 01

    Choose your treatment

    Select the program that fits your goals.

  2. Step 02

    Complete your evaluation

    Answer a medical intake for physician review.

  3. Step 03

    Complete labs when required

    At-home lab kit shipped to your door.

  4. Step 04

    Physician review

    Your intake and labs are reviewed.

  5. Step 05

    Treatment delivered

    If approved, your medication ships to you.

Questions

About Sildenafil

If your question isn't here, your physician is one message away after you start your intake.

  • Sildenafil and Tadalafil are both an oral tablet, prescription medicines that are FDA approved to treat erectile dysfunction (ED).

  • Sildenafil and Tadalafil are in a group of medications called phosphodiesterase 5 (PDE5) inhibitors. Sildenafil and Tadalafil treat ED by increasing blood flow to the penis during sexual stimulation, which leads to an erection. Sildenafil is taken one hour before sexual activity and its effects last 4-6 hours. Tadalafil can be taken up to 36 hours before sexual activity and therefore is often known as the “weekender”.

  • ED medications work by relaxing the blood vessels in the penis, allowing for increased blood flow when sexually stimulated. This enhanced blood flow can lead to firmer and longer-lasting erections. The onset of action varies between different ED medications. Sildenafil and Tadalafil ideally are taken 1 hour before expected sexual activity but since Tadalafil gives you the ability to obtain an erection for up to 36 hours, Tadalafil gives you extra convenience. Daily Tadalafil at a lower dose (5mg) is also an option and this gives you the ability to obtain an erection without needing to time a dose to match expected sexual activity. ED medications don’t automatically cause an erection. Sexual stimulation is still required to trigger the response. The medication simply enhances the body’s natural response to sexual arousal.

  • Both medications should be taken with a full glass of water and can be taken on an empty stomach or with a normal-sized meal. It’s important to note that Sildenafil and Tadalafil will not give you an erection for the entire period that they are in your system. They simply allow you to achieve a satisfactory erection when you are sexually stimulated.

  • Sildenafil and Tadalafil are generally safe and well-tolerated by most men. However, like any medication, they can have side effects. Common side effects of ED medications may include: Headache: This is one of the most common side effects reported with ED medications. It is usually mild and transient. Facial flushing: Some men may experience redness or warmth in the face and neck. Nasal congestion: Stuffy or runny nose can occur as a side effect. Upset stomach: Some men may experience indigestion or gastrointestinal discomfort. Dizziness: ED medications can cause a temporary drop in blood pressure, leading to dizziness in some individuals. Vision changes: Some men may experience mild and temporary changes in vision, such as a blue tinge or blurred vision. Back pain or muscle aches: These side effects are less common but can occur. Priapism: This is a rare but potentially serious side effect. Priapism is a prolonged and painful erection that lasts for more than four hours. It requires immediate medical attention to prevent tissue damage to the penis. It’s important to note that not everyone will experience these side effects, and they are usually mild and temporary. If you do experience any of these side effects and find them bothersome or persistent, you should contact your healthcare provider. It’s also essential to be aware that ED medications may not be suitable for everyone, especially men with certain medical conditions or those taking specific medications. For example, men who have severe heart disease, uncontrolled hypertension, or are taking nitrates for chest pain should avoid ED medications due to potential interactions and health risks.

  • For Sildenafil (all strengths) or Tadalafil (10mg or 20mg), take 1 tablet as needed for sexual activity. Do not take any more than is directed by your doctor. If you are taking daily Tadalafil (5mg), take your dose around the same time each day. If you miss a dose, take that dose once you remember if it’s still within the same-day. If you completely miss your daily dose, do not double up the next day. You can just get back on your normal dosing schedule as prescribed by your doctor.

  • Keep this medication in the original container that you received it in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom).

Medical disclaimer. This is a prescription therapy and should only be used under the supervision of a licensed healthcare provider. Individual results vary, and treatment decisions are based on symptoms, history, and provider evaluation. Happy Labs is not a substitute for your primary care doctor.