Diphenhydramine is a commonly-used antihistamine drug. Since it is a basic drug, it is usually administered as the hydrochloride salt (Figure 6.) Thus, in various portions of your digestive tract, the drug may be present either as the free base (B) or the protonated form (BH+), depending on the pH. (Figure 4)
An independent contractor contracts with an employer to do a particular piece of work. This working relationship is a flexible one that provides benefits to both the worker and the employer. However, there are drawbacks to the relationship as well.
Subcontractors are frequently hired to work on construction sites. A subcontractor agreement specifies the terms of a relationship between a contractor and subcontractor, including the type of work the subcontractor is being hired to perform. Electricians may work as subcontractors on a construction project.