Having read the contraindications, adverse reactions and so forth I think I'll stick with Echinacea, Astragalus and other immune system stimulating herbs.
Remember the listed Contraindications are for people receiving treatment for cancer. Side effects for healthy people could be very different.
The article is suggesting this drug for boosting the immune system of elderly people. The elderly frequently react to drugs (have different side effects) than do people in their prime.
And as decimon stated lower dosages can have different effects. Also if you read the website down below the box you will note the drug is frequently used with another drug. Being a drug used for helping boost cancer patents immune systems I would expect this drug to be part of a patient’s daily drug cocktail.
As for medicinal herbs; you have to be aware of possible side effects of those as well.