Jabo,
Patients with normal immunological profiles like the typical SCLS patient, and who are on an IVIG therapy, have extra supplies of immunities circulating through their blood.
This helps to combat a number of illnesses but not always the common cold.
In my case, for example, I noticed that during the past 5 years that I have been on IVIG, I have had very few colds relative to the rest of my family, and whenever I do catch a cold, it goes away a lot faster than those of the rest of my family. I credit IVIG for that.
Of course, the first time I got a cold, my family and I worried that maybe an episode of SCLS would follow. Therefore, I pulled out my HemoCue device and tested my blood 2-3 times a day, and was reassured to see that my Hgb reading was remaining within its normal range.
After all, when your nose drips, you ARE having a capillary leak -- but it does not signal, never mind precipitate, the systemic, internal bleeding which constitutes an episode of SCLS.
In my early days, my episodes of SCLS would be preceded by cold- and flu-like symptoms, but over time they were not.
As we say in social science, "a correlation does not imply causation. It may be purely coincidental, or caused by a third factor."
As to what medications one may or may not take when having a cold, I am not aware of any recommendations either way.
In sum, if anybody is ever worried about a cold in a patient with SCLS, whether they are or are not on IVIG, the best thing to do is to monitor their blood for hemoconcentration.
If they don't have a portable Hgb analyzer, then they can ask their physician to order a series of blood tests for hemoconcentration, to be done in an outpatient facility where all kinds of blood, urine and other tests are routinely performed. It will take several hours to get the result back, but for SCLS patients on IVIG, the results that come back should be reassuring.