Is it possible to give Groprinosin after a month's break?

Yes, you can especially as there is an active viral infection. Treatment usually lasts 5–14 days; the drug should be administered for 1-2 days after the disappearance of symptoms. Dosage regimen of syrup depending on the child's body weight: body weight 10–14 kg: 5 ml 3 times a day; body weight 15–20 kg: 5–7.5 ml 3 times a day; body weight 21–30 kg: 7.5–10 ml 3 times a day; body weight 31–40 kg: 10–15 ml 3 times a day; body weight 41–50 kg: 15–17.5 ml 3 times a day. To measure the correct dose, use the measuring cup provided in the package. Do not use the preparation during the treatment of atopic dermatitis in children. I add information that may be useful: https://www.gdziepolek.pl/artykuly/naturalne-antybiotyki-ziola-i-domowe-sposoby-na-infekcje https://www.gdziepolek.pl/kategorie/witaminy-i-suplementy-na-odpornosc