What side effect is commonly associated with Tricyclic antidepressants?

Tricyclic antidepressants (TCAs) are known for a variety of side effects due to their non-specific action on neurotransmitter systems. All the listed options— increased appetite, tachycardia, and blurred vision—are indeed potential side effects associated with the use of TCAs.

Increased appetite may occur as a result of these medications influencing serotonin and other neurotransmitters involved in hunger regulation. Tachycardia can occur due to the anticholinergic properties of TCAs, leading to an increase in heart rate as they block the effects of acetylcholine in the body. Blurred vision is another common anticholinergic side effect, which arises from the medication's ability to affect the muscles that control eye focus.

Thus, the choice indicating all of these side effects is correct because TCAs can produce a broad range of effects on both the central nervous system and peripheral systems, manifesting in various ways including alterations in appetite, heart rate, and vision.