If you take one expired sildenafil tablet, you may feel no different from taking an in-date dose. Sildenafil does not become poisonous or toxic when it expires, but it will be less reliable because the tablet’s strength and quality are no longer guaranteed.
The safest response is to avoid taking another expired tablet, and do not take extra to make up for a weak effect. Instead, replace the medicine through a licensed pharmacy. Get urgent medical care if you experience chest pain, fainting, sudden vision or hearing loss, or an erection that lasts longer than four hours.
This guide explains what happens if you take expired sildenafil, how it can change over time, and what you should do if you already swallowed an expired Viagra or generic sildenafil tablet.
Does Viagra (sildenafil) expire?
Yes, commercially available sildenafil citrate tablets, including Viagra, typically expire 24 months after they are manufactured when stored as directed.
In some cases, you might see one date on the original blister or stock bottle and another on the pharmacy label. The pharmacy may assign a discard date after it transfers tablets into a prescription container. Poison Control notes that pharmacies may use a date one year after dispensing or an earlier date when the manufacturer’s lot expires sooner.
Follow the date and instructions on the container dispensed to you. Ask the pharmacist if the dates conflict or the label is difficult to read. The pharmacist can check the product record and tell you which date applies.
Does expired Viagra (sildenafil) still work?
Expired Viagra or generic sildenafil may still work after the expiration date, but there’s no guarantee. Medicines do not suddenly lose all their efficacy when they reach their expiration date. If properly stored, it may remain stable afterward, especially solid tablets like sildenafil.
FDA testing examined more than 100 prescription and over-the-counter medicines. The results showed that about 90% remained safe and effective for as long as 15 years beyond their original expiration dates. According to Loel Dawis, the FDA’s expiration-date chief, most medicines may last as long as those tested, although there are several exceptions, including nitroglycerin, insulin, and liquid antibiotics.
Some of the strongest evidence that medicines can remain effective after expiration comes from the FDA’s Shelf-Life Extension Program, or SLEP. The program was created for the Department of Defense to reduce the cost of replacing military medicine supplies. SLEP found that 88% of 122 medicines stored under ideal conditions qualified for an expiration-date extension of more than one year. The average extension was 66 months, while the longest was 278 months.
However, we can’t apply these findings to household sildenafil. The program involved selected federal stockpiles stored under controlled conditions. A bottle of sildenafil or Viagra that is kept in a bathroom, drawer, suitcase, or car may have already degraded or undergone chemical change.
Recently, a 2026 study also found that out of 3786 samples of expired products, 89.1% remained stable after expiration, but only four samples were clinically effective.
What happens if you take expired sildenafil?
The expired sildenafil tablet may not work as reliably. Sildenafil helps produce an erection by supporting increased blood flow to the penis during sexual stimulation. Expired medicines may become weaker or undergo chemical changes that affect their safety and efficacy.
It’s also not advisable to take an extra dose. A common mistake is taking another tablet when the expired sildenafil tablet seemed ineffective, but this can increase overdose risk.
For erectile dysfunction, the labeled maximum frequency is generally once per day. Taking more than prescribed can increase headache, flushing, dizziness, low blood pressure, vision changes, and prolonged erection. An expired dose may still contain enough sildenafil to cause side effects.
Expiration does not cancel drug interactions either. A person who takes nitroglycerin can still develop a dangerous drop in blood pressure after swallowing old sildenafil if the tablet remains active.
Is it safe to take expired Viagra (sildenafil)?
Taking a single tablet of expired Viagra will generally not make you ill. According to Poison Control, expired medicines are generally not toxic. However, taking expired Viagra or sildenafil is still not recommended because ineffective medicine can leave the treated condition inadequately controlled. The FDA also advises people not to use expired medicines because their safety and effectiveness are no longer guaranteed.
Another risk to consider is contamination. Expiration testing assumes the medicine remains under its labeled conditions. One current generic sildenafil label recommends storage at 25°C or 77°F. It allows brief temperature excursions from 15°C to 30°C or 59°F to 86°F. The patient instructions give a room-temperature range of 20°C to 25°C or 68°F to 77°F.
Long exposure to a hot vehicle, a humid bathroom, or direct sunlight falls outside those ideal conditions. Poor storage can damage a medicine before its printed date.
How to tell if sildenafil has gone bad
Do not take a sildenafil tablet when you notice any of these problems.
-
- The tablet is cracked, crumbling, swollen, sticky, damp, or unusually soft
- Its color has changed noticeably
- It has an unusual odor
- The blister is open, torn, or punctured
- The bottle has water damage or no longer closes properly
- The label is missing or unreadable
- You cannot identify the strength
- You do not know where the pill came from
These signs can reveal obvious physical damage.
How to dispose of expired sildenafil safely
The FDA says a medicine take-back location or mail-back program is the preferred option for most expired medicines. Many retail pharmacies, hospital pharmacies, clinics, and law enforcement facilities offer collection boxes.
If no take-back option is readily available and the label gives no special instructions, the FDA provides these household trash steps.
-
- Remove the tablets from their original container.
- Mix them without crushing with dirt, used coffee grounds, or cat litter.
- Put the mixture in a sealed bag or container.
- Place the sealed container in the household trash.
- Remove or scratch out personal information on the prescription label.
Do not keep expired sildenafil tablets where a child, visitor, or pet can reach them. Proper disposal prevents expired medicines from being taken accidentally or misused. In 2020, the CDC estimated that children aged five and younger made 36,564 emergency department visits after accessing medicines without adult supervision.
What to do if you took expired sildenafil
Stay calm if you took one expired tablet by mistake and feel well. Do not take another sildenafil dose or a different erectile dysfunction medicine to compensate. Keep the package nearby so you can report the strength, expiration date, source, and approximate time you took it.
Follow these steps.
-
- Stop taking tablets from the expired supply.
- Do not repeat the dose because it seems slow or weak.
- Avoid nitrates, poppers, and any additional erectile dysfunction drug.
- Monitor for headache, flushing, stomach upset, dizziness, vision changes, and other sildenafil effects.
- Contact a pharmacist, your prescriber, or Poison Control if you are unsure what to do.
Poison Control offers free and confidential guidance at 1-800-222-1222 and through its online tool. Call emergency services when symptoms are severe.
Get emergency help for these symptoms
Seek immediate care if you develop any of the following.
-
- Chest pain, fainting, severe dizziness, or severe trouble breathing
- An erection lasting longer than four hours
- Sudden loss or marked decrease of vision in one or both eyes
- Sudden hearing loss, sometimes with ringing in the ears or dizziness
- Swelling of the face, lips, tongue, or throat
- Trouble breathing or swallowing
Tell emergency clinicians that you took sildenafil, including the dose and time.
Frequently Asked Questions
Related Articles
