Excerpt from the original site..
Mr. D. stated that he felt “something akin to anger or frustration” at Alicia’s constant struggle. He reported that, for the first time, he thought of drugging Alicia with the sedating tricyclic antidepressant amitriptyline. The medication was in 25 mg tablet form, which he placed in the victim’s vagina and rectum. Mr. D. also fed the victim through a straw, into which he had placed medication. When sedation took effect, the victim’s struggles quieted.
…Mr. D. drugged Gary with amitriptyline and diphenhydramine.
LABEL: ROBITUSSIN SEVERE MULTI-SYMPTOM COUGH COLD FLU NIGHTTIME
Acetaminophen, USP 650 mg
Diphenhydramine HCl, USP 25 mg
Phenylephrine HCl, USP 10 mg
Is Robitussin the same as dextromethorphan?
Robitussin and Mucinex are two over-the-counter remedies for chest congestion. The active ingredient in Robitussin is dextromethorphan, while the active ingredient in Mucinex is guaifenesin. However, the DM version of each medicine contains both active ingredients.