Firstly, there are no reports of the antiviral medication triggering GBS. Secondly, there is nothing about the medication that would make me expect it to be able to trigger GBS. And, thirdly and most importantly, because GBS is an immune illness the disease doesn’t come on until 10-20 days after the triggering event whereas your GBS came on 24 hours after taking the medication. So we can be confident that in your case the medicationn did not trigger your GBS.