Is it possible to put off Nebinad due to malaise, if the husband has good pressure, only a pulse of 90?

Hello, my husband was in the hospital for coronavirus, where pneumonia and a rapid pulse of more than 100 were found. After several days of treatment with heparime, he was discharged home. Nebinad half a tablet or 2.5mg was saved for the pulse. The husband took today the third day, while he feels terrible after him - abdominal pain, nausea, lack of appetite. I note that the ecg and echo of the heart showed no changes. Pressure also in 120/80, only this pulse too high. is it possible to immediately put away this nebinad due to very malaise? Without it, it was much better. Pulse now about 90.