Yes, you can, especially if the medication is used as directed by your doctor. 

Tamiliv is an antiviral medicine, while Sumamed is an antibiotic, an antibacterial medicine. Perhaps during a viral infection it is accompanied by a bacterial superinfection, which is why an antibiotic was also used.

If you have any doubts, please always consult your doctor. Your doctor must be informed of all prescription and over-the-counter medications you are taking. If you are concerned about this situation, it is always advisable to consult a doctor who can give you more personalized advice. If you do not have the opportunity to take advantage of the advice, I am attaching a link to the online teleconsultation:
https://www.gdziepolek.pl/telekonsultacja

Below are also links to articles that may be of interest to you:

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https://www.gdziepolek.pl/tematy/jak-szybko-wyleczyc-grype

https://www.gdziepolek.pl/artykuly/fakty-i-mity-o-antybiotykach

https://www.gdziepolek.pl/blog/antybiotyki-czy-przestana-dzialac