Medication (sleeping pills)

Although the pill that Taylor slipped into Althea's drink is unknown, there are many well known medications that can cause drowsiness, blurred vision or slurred speech. The pill that Taylor used could be one of these, or a combination of these, or a whole new type of drug.

Antidepressants
A type of antidepressant called tricyclic has the possibility of making someone drowsy. There are different types of antidepressants, including amitriptyline, doxepin, imipramine, and trimipramine.

Antihistamines (Allergy Medications)
Such as diphenhydramine, brompheniramine, hydroxyzine, and meclizine. Some of these are in sleeping pills too.

Alendronate
A class of medication called bisphosphonates that is used to treat osteoporosis. It can cause blurred vision.

Topiramate
This can cause acute glaucoma, which can damage the optic nerve.

Isotretinoin
Treats serious acne and is possible to cause adverse eye effects. This is contained in accutane, a medicine that Althea is currently taking, so it is unknown whether she had eye issues prior to the car crash.