Conflict is when a character struggles with him/herself. internal external

In fiction, ‘internal conflict’ refers to a character’s internal struggle. A character might struggle with an emotional problem such as fear of intimacy or abandonment

Hey there!

The answer is :Internal 

Reason/ Definition: 
1.
situated or existing in the interior of something; interior.
2.
of, relating to, or noting the inside or inner part.
3.
Pharmacology. oral (def 4).

Hopes this Helps you :D

The only reason based on my own answer or some of my instinct jack flack up and down and then twist all around before taking his medicine is because the label of his medicine says that you need to shake well before using or before taking it.