Andre has admitted to having a 'hilarious' experience himself after taking the anti-impotency drug when it first came on the market.
And now the 38-year-old has offered his advice after it was revealed that Take That singer Williams, 37, who is married to Ayda Field, was having the jabs to boost his low energy levels.
He wrote in his New! magazine column: 'Rob, I've got one word of advice for you, Viagra.
'Go and get it and have fun. I tried it when it first came out to see what all the fuss was about. I will spare you the details, but it was hilarious. Talk about an extra boost.'
Peter added that taking the drug was a one-off - but he hasn't ruled out trying it again one day.
He said: 'Thankfully, I haven't needed much help in that area, but I can't say I won't ever need it one day!'