Sudafed might be a more likely choice because it doesn't cause drowsiness.

I did a little online checking to answer the question. I found this reference:

"Some of the crew's grumpiness during the mission could be attributed to physical discomfort. About 15 hours into the flight, Schirra developed a bad cold, and Cunningham and Eisele soon followed suit. A cold is uncomfortable enough on the ground; in weightless space it presents a different problem. Mucus accumulates, filling the nasal passages, and does not drain from the head. The only relief is to blow hard, which is painful to the ear drums. So the crewmen of Apollo 7 whirled through space suffering from stopped up ears and noses. They took aspirin and decongestant tablets and discussed their symptoms with the doctors.

Several days before the mission ended, they began to worry about wearing their suit helmets during reentry, which would prevent them from blowing their noses. The buildup of pressure might burst their eardrums. Slayton, in mission control, tried to persuade them to wear the helmets, anyway, but Schirra was adamant. They each took a decongestant pill about an hour before reentry and made it through the acceleration zone without any problems with their ears."