Paragliding, in general, is a very safe sport so long as you follow the rules and regulations. Actually it is as safe as driving. And if you are in a country where driving is not really safe then paragling is most probably safer than that.
But you should also keep in mind that paragliding is an extreme sport which has serious consequences if you start feeling overconfident and bypassing some basic rules and precautions. Unfortunately that’s what happens with some companies that are offering you tandem paragliding service in exchange for money. I’m not talking about all of them of course but there are a few companies like that… companies that make money out of tandem paragliding, naturally want to have as many sorties as they can per day per paraglider. Which means that they sometimes tend to bypass some precautions even though they take so little time… Or they sometimes overuse a glider which should have been thrown away a long time ago. Or they may take off even if the weather requires them to wait a little longer. These companies are not able to hold their grounds for a long time anyway.
As I said, paragliding is a safe sport so long as you follow the rules and regulations and if the company that offers you tandem paragliding follows them as well, there is nothing to worry about. For that, I would suggest choosing a well known, established company and you shouldn’t mind paying a little higher than other alternatives.