Is it safe to drink two days after a pneumothorax?

Not usual. Alcohol does not generally have direct impact on pneumothorax per se. However, over all care may be impacted. If your pneumothorax is being treated, you may be on medications that should not mix with alcohol. If your pneumothorax is being observed for worsening or recurrence, you should not drink as may mask your symptoms. Discuss with your thoracic surgeon your case specifics.
Swallow yes. Some beverages are more desirable! it is likely that one should wait a couple of weeks before alcohol, just in case there is a recurrence and one needs to be in control!
Pneumothorax. Drinking alcohol 2 days after pneumothorax should have no effect on pneumothorax.