How Will the Keystone XL Pipeline Be Built? If President Obama approves the hot-button Keystone XL pipeline, TransCanada has plenty of work to do to build the Montana-to-Nebraska connection. This is how its engineers plan to do it.
Side effects of a dose of levothyroxine that is too low would be similar to the symptoms of hypothyroidism. Symptoms of hypothyroidism, or underactive thyroid, include fatigue, weight gain, and constipation.
Types of drugs that interact with levothyroxine include: 1  Amphetamines. 2  Aspirin. 3  Blood thinners such as warfarin (Coumadin) 4  Antidepressants or drugs used to treat anxiety. 5  Heart medications, such as metoprolol (Lopressor, Toprol), propranolol (Inderal), and digoxin (Lanoxin) 6  Anti-seizure drugs such as phenytoin (Dilantin)