21. Often drug manufacturers offer combinations of their more popular antihistamines with a decongestant . 22. Adverse effects of decongestants may include nervousness, agitation, palpitations and insomnia. 23. Adding garlic, cayenne pepper or curry powder will also act as decongestants . 24. Some decongestant manufacturers said they would reformulate with pseudoephedrine. 25. Ephedra turns up in diet pills, in decongestants sold over the counter. 26. Decongestants work by shrinking nasal passages and reducing congestion.27. The effects of the decongestant pseudoephedrine are more uncertain. 28. A hot shower and some decongestants and I'll be just fine! 29. Some herbalists recommend capsaicin-rich foods as a sort of natural decongestant . 30. In adults short term use of nasal decongestants may have a small benefit.