Man G Tablet: what to know before you buy or use it

Reviewed by Pharm. Chidera Samuel Last updated: 2026-04-25

General medicine information only; a pharmacist or clinician should confirm whether it is safe for you.

If you are looking at Man G tablet, the first thing to know is simple: it is sildenafil 100 mg for erectile dysfunction, and it is not a medicine to buy blindly. A quick safety check matters here because some health conditions and medicines can make it risky.

What Man G tablet actually contains

Man G is a brand of sildenafil citrate tablets. The official label states that each film-coated tablet contains sildenafil citrate equivalent to sildenafil 100 mg.

It is used for erectile dysfunction. In plain terms, it helps increase blood flow to the penis during sexual stimulation. It is not a general body-strength tablet, and it does not create sexual desire on its own.

The brand information posted for MAN-G also describes the pack as a carton containing a blister of 4 tablets.

Do not let the 100 mg pack decide your dose

This part is important. The official sildenafil guidance says the usual adult starting dose is 50 mg, taken about 1 hour before sex, with a window of roughly 30 minutes to 4 hours before sex. It should not be taken more than once in 24 hours.

Because Man G is a 100 mg tablet, you should not assume that swallowing the whole tablet is automatically the right place to start, especially if you are new to sildenafil or you have other medical issues. A pharmacist or clinician should help you decide whether this strength is suitable.

It is often best taken on an empty stomach. If you take it with food, especially a heavy meal, it may take longer to work.

Who needs a pharmacist or doctor check first

Do not use Man G if you take nitrates in any form for chest pain or heart problems. That combination can cause a dangerous drop in blood pressure.

You should also stop and ask before using it if you have serious heart or liver problems, low blood pressure, a recent heart attack or stroke, unstable angina, certain inherited eye problems such as retinitis pigmentosa, or conditions linked with a higher risk of prolonged erection such as sickle cell anaemia, leukaemia, or multiple myeloma.

It also needs proper review if you have Peyronie's disease, a stomach ulcer, a bleeding disorder, kidney problems, or blood pressure problems you are not sure are well controlled.

Medicine, supplement and alcohol clashes to ask about

Tell the pharmacist or clinician about everything you use, not only prescription medicines. That includes supplements, herbal products and anything bought without a prescription.

The official label and patient guidance flag important interaction risks with nitrates, riociguat, ritonavir, ketoconazole, erythromycin, itraconazole, cimetidine and rifampicin. These examples matter because they can increase side effects, reduce effectiveness, or make sildenafil unsafe.

Alcohol matters too. Drinking a lot can make it harder to get an erection and may worsen dizziness or light-headedness. Recreational drugs, including poppers, are not safe with sildenafil.

Side effects: what is common and what is a red flag

Common side effects of sildenafil can include headache, flushing, indigestion, nausea, a blocked nose and dizziness. Some people notice these effects mildly and briefly, but they should still be taken seriously if they are strong or keep happening.

What should not be ignored is chest pain, severe dizziness or fainting, sudden loss of vision, a sudden major change in hearing, seizure, signs of a serious allergic reaction, or an erection that lasts more than 4 hours. Those are not wait-and-see situations.

What to confirm on the pack before you go

Check that the name and strength match what you intended to buy: Man-G Sildenafil Citrate Tablets 100 mg. Check the printed expiry date on the exact pack being dispensed, not just the shelf label.

The official storage advice is to keep it below 30C, in a cool dry place, protected from light. If the carton looks tampered with, the blister is damaged, or the details on the pack are unclear, pause and ask questions before paying.

Quick safety checklist before buying or taking Man G

• Confirm the pack says Man-G Sildenafil Citrate Tablets 100 mg and check the expiry date on the dispensed pack.
• Do not use it if you take nitrates or riociguat.
• Ask a pharmacist or doctor first if you have heart disease, low blood pressure, recent stroke or heart attack, liver or kidney problems, or an eye condition such as retinitis pigmentosa.
• Mention all medicines, supplements and herbal products before use, especially ritonavir, ketoconazole, erythromycin, itraconazole, cimetidine or rifampicin.
• Do not assume a 100 mg tablet is the right starting dose for you.
• Do not take it more than once in 24 hours.
• Go easy on alcohol and avoid recreational drugs such as poppers.
• Store it in a cool dry place below 30C and protect it from light.

Get urgent medical help if you have any of these after taking it

• Chest pain during or after sex
• Severe dizziness, collapse or fainting
• Sudden loss of vision or a major sudden change in hearing
• A painful erection or one that lasts more than 4 hours
• Seizure
• Swelling, wheezing or trouble breathing

Sources & further reading

• Amela Pharmacy product page: Man-G Sildenafil Citrate Tablets 100 mg
• NAFDAC MAN-G SmPC
• NHS: How and when to take sildenafil
• NHS: Who can and cannot take sildenafil
• NHS: Taking sildenafil with other medicines and herbal supplements
• NHS: Side effects of sildenafil
• NHS: Common questions about sildenafil